21534692 has 6 divisors (see below), whose sum is σ = 37685718. Its totient is φ = 10767344.

The previous prime is 21534683. The next prime is 21534727. The reversal of 21534692 is 29643512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13147876 + 8386816 = 3626^2 + 2896^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2691833 + ... + 2691840.

It is an arithmetic number, because the mean of its divisors is an integer number (6280953).

Almost surely, 2^21534692 is an apocalyptic number.

It is an amenable number.

21534692 is a deficient number, since it is larger than the sum of its proper divisors (16151026).

21534692 is a wasteful number, since it uses less digits than its factorization.

21534692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5383677 (or 5383675 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 21534692 is about 4640.5486744565. The cubic root of 21534692 is about 278.2143680658.

The spelling of 21534692 in words is "twenty-one million, five hundred thirty-four thousand, six hundred ninety-two".