21275774 has 16 divisors (see below), whose sum is σ = 34445040. Its totient is φ = 9797760.

The previous prime is 21275747. The next prime is 21275809. The reversal of 21275774 is 47757212.

It is a congruent 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, 20582 + ... + 21590.

It is an arithmetic number, because the mean of its divisors is an integer number (2152815).

Almost surely, 2^21275774 is an apocalyptic number.

21275774 is a deficient number, since it is larger than the sum of its proper divisors (13169266).

21275774 is a wasteful number, since it uses less digits than its factorization.

21275774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835.

The product of its digits is 27440, while the sum is 35.

The square root of 21275774 is about 4612.5669642836. The cubic root of 21275774 is about 277.0948512420.

The spelling of 21275774 in words is "twenty-one million, two hundred seventy-five thousand, seven hundred seventy-four".