1021211220000 has 240 divisors, whose sum is σ = 3465292501440. Its totient is φ = 262932096000.

The previous prime is 1021211219939. The next prime is 1021211220011. The reversal of 1021211220000 is 221121201.

It is a tau number, because it is divible by the number of its divisors (240).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1446549 + ... + 2033451.

It is an arithmetic number, because the mean of its divisors is an integer number (14438718756).

Almost surely, 2^{1021211220000} is an apocalyptic number.

1021211220000 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 1021211220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1732646250720).

1021211220000 is an abundant number, since it is smaller than the sum of its proper divisors (2444081281440).

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

1021211220000 is an equidigital number, since it uses as much as digits as its factorization.

1021211220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586965 (or 586942 counting only the distinct ones).

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

Adding to 1021211220000 its reverse (221121201), we get a palindrome (1021432341201).

The spelling of 1021211220000 in words is "one trillion, twenty-one billion, two hundred eleven million, two hundred twenty thousand".