102002010021 has 16 divisors (see below), whose sum is σ = 151178788800. Its totient is φ = 67972225104.

The previous prime is 102002010001. The next prime is 102002010043. The reversal of 102002010021 is 120010200201.

It is not a de Polignac number, because 102002010021 - 2²¹ = 101999912869 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 = 102002009985 and 102002010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102002010001) 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, 744426 + ... + 870731.

It is an arithmetic number, because the mean of its divisors is an integer number (9448674300).

Almost surely, 2^102002010021 is an apocalyptic number.

It is an amenable number.

102002010021 is a deficient number, since it is larger than the sum of its proper divisors (49176778779).

102002010021 is a wasteful number, since it uses less digits than its factorization.

102002010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1617505 (or 1617499 counting only the distinct ones).

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

Adding to 102002010021 its reverse (120010200201), we get a palindrome (222012210222).

The spelling of 102002010021 in words is "one hundred two billion, two million, ten thousand, twenty-one".