1021421221320 has 64 divisors (see below), whose sum is σ = 3064365342720. Its totient is φ = 272369954304.

The previous prime is 1021421221319. The next prime is 1021421221357. The reversal of 1021421221320 is 231221241201.

It is a happy number.

It is a super-2 number, since 2×1021421221320² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3992292 + ... + 4240428.

It is an arithmetic number, because the mean of its divisors is an integer number (47880708480).

Almost surely, 2^{1021421221320} is an apocalyptic number.

1021421221320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021421221320 is an abundant number, since it is smaller than the sum of its proper divisors (2042944121400).

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

1021421221320 is a wasteful number, since it uses less digits than its factorization.

1021421221320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282454 (or 282450 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 1021421221320 its reverse (231221241201), we get a palindrome (1252642462521).

The spelling of 1021421221320 in words is "one trillion, twenty-one billion, four hundred twenty-one million, two hundred twenty-one thousand, three hundred twenty".