21275634 has 16 divisors (see below), whose sum is σ = 42706080. Its totient is φ = 7066080.

The previous prime is 21275623. The next prime is 21275651. The reversal of 21275634 is 43657212.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4624 + ... + 7995.

It is an arithmetic number, because the mean of its divisors is an integer number (2669130).

Almost surely, 2^21275634 is an apocalyptic number.

21275634 is an abundant number, since it is smaller than the sum of its proper divisors (21430446).

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

21275634 is a wasteful number, since it uses less digits than its factorization.

21275634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12905.

The product of its digits is 10080, while the sum is 30.

The square root of 21275634 is about 4612.5517883272. The cubic root of 21275634 is about 277.0942434558.

The spelling of 21275634 in words is "twenty-one million, two hundred seventy-five thousand, six hundred thirty-four".