21689274 has 32 divisors (see below), whose sum is σ = 46333440. Its totient is φ = 6753600.

The previous prime is 21689273. The next prime is 21689309. The reversal of 21689274 is 47298612.

It is not an unprimeable number, because it can be changed into a prime (21689273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3384 + ... + 7404.

It is an arithmetic number, because the mean of its divisors is an integer number (1447920).

Almost surely, 2^21689274 is an apocalyptic number.

21689274 is an abundant number, since it is smaller than the sum of its proper divisors (24644166).

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

21689274 is a wasteful number, since it uses less digits than its factorization.

21689274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4086.

The product of its digits is 48384, while the sum is 39.

The square root of 21689274 is about 4657.1744652740. The cubic root of 21689274 is about 278.8784815287.

The spelling of 21689274 in words is "twenty-one million, six hundred eighty-nine thousand, two hundred seventy-four".