21269512 has 32 divisors (see below), whose sum is σ = 45799200. Its totient is φ = 9158400.

The previous prime is 21269471. The next prime is 21269527. The reversal of 21269512 is 21596212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4689 + ... + 8032.

It is an arithmetic number, because the mean of its divisors is an integer number (1431225).

Almost surely, 2^21269512 is an apocalyptic number.

21269512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21269512 is an abundant number, since it is smaller than the sum of its proper divisors (24529688).

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

21269512 is a wasteful number, since it uses less digits than its factorization.

21269512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12757 (or 12753 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 21269512 is about 4611.8881165961. Note that the first 3 decimals coincide. The cubic root of 21269512 is about 277.0676632265.

It can be divided in two parts, 2126951 and 2, that added together give a triangular number (2126953 = T₂₀₆₂).

The spelling of 21269512 in words is "twenty-one million, two hundred sixty-nine thousand, five hundred twelve".