20000021001021 has 36 divisors (see below), whose sum is σ = 29244179707392. Its totient is φ = 13170555109152.

The previous prime is 20000021001007. The next prime is 20000021001097. The reversal of 20000021001021 is 12010012000002.

It is not a de Polignac number, because 20000021001021 - 2¹⁰ = 20000020999997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20000021000994 and 20000021001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000021001001) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 59773230 + ... + 60106896.

Almost surely, 2^{20000021001021} is an apocalyptic number.

It is an amenable number.

20000021001021 is a deficient number, since it is larger than the sum of its proper divisors (9244158706371).

20000021001021 is a wasteful number, since it uses less digits than its factorization.

20000021001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334258 (or 334026 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20000021001021 its reverse (12010012000002), we get a palindrome (32010033001023).

The spelling of 20000021001021 in words is "twenty trillion, twenty-one million, one thousand, twenty-one".