21002870203641 has 12 divisors (see below), whose sum is σ = 30337521809920. Its totient is φ = 14001893795160.

The previous prime is 21002870203561. The next prime is 21002870203691. The reversal of 21002870203641 is 14630207820012.

It is a happy number.

21002870203641 is a `hidden beast` number, since 2 + 1 + 0 + 0 + 2 + 8 + 7 + 0 + 2 + 0 + 3 + 641 = 666.

It is not a de Polignac number, because 21002870203641 - 2¹⁸ = 21002869941497 is a prime.

It is a super-2 number, since 2×21002870203641² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002870203596 and 21002870203605.

It is not an unprimeable number, because it can be changed into a prime (21002870203691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8281080 + ... + 10515798.

Almost surely, 2^{21002870203641} is an apocalyptic number.

It is an amenable number.

21002870203641 is a deficient number, since it is larger than the sum of its proper divisors (9334651606279).

21002870203641 is a wasteful number, since it uses less digits than its factorization.

21002870203641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3278996 (or 3278993 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 21002870203641 in words is "twenty-one trillion, two billion, eight hundred seventy million, two hundred three thousand, six hundred forty-one".