21000202412 has 24 divisors (see below), whose sum is σ = 42004062240. Its totient is φ = 8999303040.

The previous prime is 21000202411. The next prime is 21000202441. The reversal of 21000202412 is 21420200012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (21000202411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391112 + ... + 441552.

It is an arithmetic number, because the mean of its divisors is an integer number (1750169260).

Almost surely, 2^21000202412 is an apocalyptic number.

It is an amenable number.

21000202412 is an abundant number, since it is smaller than the sum of its proper divisors (21003859828).

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

21000202412 is a wasteful number, since it uses less digits than its factorization.

21000202412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65321 (or 65319 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21000202412 its reverse (21420200012), we get a palindrome (42420402424).

The spelling of 21000202412 in words is "twenty-one billion, two hundred two thousand, four hundred twelve".