12921534 has 24 divisors (see below), whose sum is σ = 28262520. Its totient is φ = 4266288.

The previous prime is 12921527. The next prime is 12921583. The reversal of 12921534 is 43512921.

12921534 is a `hidden beast` number, since 129 + 2 + 1 + 534 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 12921498 and 12921507.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1429 + ... + 5280.

It is an arithmetic number, because the mean of its divisors is an integer number (1177605).

Almost surely, 2^12921534 is an apocalyptic number.

12921534 is an abundant number, since it is smaller than the sum of its proper divisors (15340986).

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

12921534 is a wasteful number, since it uses less digits than its factorization.

12921534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6824 (or 6821 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 12921534 is about 3594.6535298969. The cubic root of 12921534 is about 234.6594372809.

The spelling of 12921534 in words is "twelve million, nine hundred twenty-one thousand, five hundred thirty-four".