21021022001020 has 12 divisors (see below), whose sum is σ = 44144146202184. Its totient is φ = 8408408800400.

The previous prime is 21021022001011. The next prime is 21021022001093. The reversal of 21021022001020 is 2010022012012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525525550006 + ... + 525525550045.

It is an arithmetic number, because the mean of its divisors is an integer number (3678678850182).

Almost surely, 2^{21021022001020} is an apocalyptic number.

21021022001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021022001020 is an abundant number, since it is smaller than the sum of its proper divisors (23123124201164).

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

21021022001020 is a wasteful number, since it uses less digits than its factorization.

21021022001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051051100060 (or 1051051100058 counting only the distinct ones).

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

Adding to 21021022001020 its reverse (2010022012012), we get a palindrome (23031044013032).

The spelling of 21021022001020 in words is "twenty-one trillion, twenty-one billion, twenty-two million, one thousand, twenty".