21253235212 has 72 divisors (see below), whose sum is σ = 42520795856. Its totient is φ = 9280656000.

The previous prime is 21253235183. The next prime is 21253235233.

21253235212 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1261162 + ... + 1277902.

Almost surely, 2^21253235212 is an apocalyptic number.

21253235212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21253235212 is an abundant number, since it is smaller than the sum of its proper divisors (21267560644).

21253235212 is a wasteful number, since it uses less digits than its factorization.

21253235212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16871 (or 16858 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The spelling of 21253235212 in words is "twenty-one billion, two hundred fifty-three million, two hundred thirty-five thousand, two hundred twelve".