21082512 has 40 divisors (see below), whose sum is σ = 59415840. Its totient is φ = 6388480.

The previous prime is 21082483. The next prime is 21082517. The reversal of 21082512 is 21528012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21082517) 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, 19437 + ... + 20492.

It is an arithmetic number, because the mean of its divisors is an integer number (1485396).

Almost surely, 2^21082512 is an apocalyptic number.

21082512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21082512 is an abundant number, since it is smaller than the sum of its proper divisors (38333328).

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

21082512 is a wasteful number, since it uses less digits than its factorization.

21082512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39951 (or 39945 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 21082512 is about 4591.5696662470. The cubic root of 21082512 is about 276.2532856567.

The spelling of 21082512 in words is "twenty-one million, eighty-two thousand, five hundred twelve".