20021021200008 has 64 divisors (see below), whose sum is σ = 55615354080000. Its totient is φ = 6673504977216.

The previous prime is 20021021200001. The next prime is 20021021200091. The reversal of 20021021200008 is 80000212012002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20021021200001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7539393 + ... + 9842991.

It is an arithmetic number, because the mean of its divisors is an integer number (868989907500).

Almost surely, 2^{20021021200008} is an apocalyptic number.

It is an amenable number.

20021021200008 is an abundant number, since it is smaller than the sum of its proper divisors (35594332879992).

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

20021021200008 is a wasteful number, since it uses less digits than its factorization.

20021021200008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2343851 (or 2343841 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The spelling of 20021021200008 in words is "twenty trillion, twenty-one billion, twenty-one million, two hundred thousand, eight".