1021021002220 has 24 divisors (see below), whose sum is σ = 2147711757408. Its totient is φ = 407728848000.

The previous prime is 1021021002149. The next prime is 1021021002223. The reversal of 1021021002220 is 222001201201.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021021002220.

It is not an unprimeable number, because it can be changed into a prime (1021021002223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42459736 + ... + 42483775.

It is an arithmetic number, because the mean of its divisors is an integer number (89487989892).

Almost surely, 2^{1021021002220} is an apocalyptic number.

1021021002220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021021002220 is an abundant number, since it is smaller than the sum of its proper divisors (1126690755188).

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

1021021002220 is a wasteful number, since it uses less digits than its factorization.

1021021002220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84944121 (or 84944119 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1021021002220 its reverse (222001201201), we get a palindrome (1243022203421).

The spelling of 1021021002220 in words is "one trillion, twenty-one billion, twenty-one million, two thousand, two hundred twenty".