21201202412 has 24 divisors (see below), whose sum is σ = 39963497616. Its totient is φ = 9783361728.

The previous prime is 21201202397. The next prime is 21201202447. The reversal of 21201202412 is 21420210212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270338 + ... + 339830.

It is an arithmetic number, because the mean of its divisors is an integer number (1665145734).

Almost surely, 2^21201202412 is an apocalyptic number.

It is an amenable number.

21201202412 is a deficient number, since it is larger than the sum of its proper divisors (18762295204).

21201202412 is a wasteful number, since it uses less digits than its factorization.

21201202412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75377 (or 75375 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21201202412 its reverse (21420210212), we get a palindrome (42621412624).

The spelling of 21201202412 in words is "twenty-one billion, two hundred one million, two hundred two thousand, four hundred twelve".