1001022000021 has 24 divisors (see below), whose sum is σ = 1447929899520. Its totient is φ = 666420954336.

The previous prime is 1001022000007. The next prime is 1001022000023. The reversal of 1001022000021 is 1200002201001.

1001022000021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1001022000021 - 2²² = 1001017805717 is a prime.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1001021999967 and 1001022000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001022000023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73226175 + ... + 73239843.

It is an arithmetic number, because the mean of its divisors is an integer number (60330412480).

Almost surely, 2^{1001022000021} is an apocalyptic number.

It is an amenable number.

1001022000021 is a deficient number, since it is larger than the sum of its proper divisors (446907899499).

1001022000021 is a wasteful number, since it uses less digits than its factorization.

1001022000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24385 (or 24382 counting only the distinct ones).

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

Adding to 1001022000021 its reverse (1200002201001), we get a palindrome (2201024201022).

The spelling of 1001022000021 in words is "one trillion, one billion, twenty-two million, twenty-one", and thus it is an aban number and an uban number.