1000021211220 has 192 divisors, whose sum is σ = 2873079465984. Its totient is φ = 259795361280.

The previous prime is 1000021211177. The next prime is 1000021211221. The reversal of 1000021211220 is 221121200001.

1000021211220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1000021211196 and 1000021211205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000021211221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 337501459 + ... + 337504421.

It is an arithmetic number, because the mean of its divisors is an integer number (14963955552).

Almost surely, 2^{1000021211220} is an apocalyptic number.

1000021211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1000021211220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1436539732992).

1000021211220 is an abundant number, since it is smaller than the sum of its proper divisors (1873058254764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1000021211220 is a wasteful number, since it uses less digits than its factorization.

1000021211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3742 (or 3740 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1000021211220 its reverse (221121200001), we get a palindrome (1221142411221).

The spelling of 1000021211220 in words is "one trillion, twenty-one million, two hundred eleven thousand, two hundred twenty".