102012000021 has 16 divisors (see below), whose sum is σ = 151788849600. Its totient is φ = 67711017744.

The previous prime is 102012000019. The next prime is 102012000047. The reversal of 102012000021 is 120000210201.

It is not a de Polignac number, because 102012000021 - 2¹ = 102012000019 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 = 102011999967 and 102012000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102012000721) 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, 8243211 + ... + 8255576.

It is an arithmetic number, because the mean of its divisors is an integer number (9486803100).

Almost surely, 2^102012000021 is an apocalyptic number.

It is an amenable number.

102012000021 is a deficient number, since it is larger than the sum of its proper divisors (49776849579).

102012000021 is a wasteful number, since it uses less digits than its factorization.

102012000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16499025 (or 16499019 counting only the distinct ones).

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

Adding to 102012000021 its reverse (120000210201), we get a palindrome (222012210222).

The spelling of 102012000021 in words is "one hundred two billion, twelve million, twenty-one", and thus it is an aban number.