20100021012 has 36 divisors (see below), whose sum is σ = 50817879840. Its totient is φ = 6698755152.

The previous prime is 20100020999. The next prime is 20100021013. The reversal of 20100021012 is 21012000102.

It is a tau number, because it is divible by the number of its divisors (36).

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 = 20100020985 and 20100021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100021013) 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, 154393 + ... + 253055.

Almost surely, 2^20100021012 is an apocalyptic number.

It is an amenable number.

20100021012 is an abundant number, since it is smaller than the sum of its proper divisors (30717858828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20100021012 is a wasteful number, since it uses less digits than its factorization.

20100021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104332 (or 104327 counting only the distinct ones).

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

Adding to 20100021012 its reverse (21012000102), we get a palindrome (41112021114).

The spelling of 20100021012 in words is "twenty billion, one hundred million, twenty-one thousand, twelve".