21867734 has 16 divisors (see below), whose sum is σ = 38002848. Its totient is φ = 9243072.

The previous prime is 21867709. The next prime is 21867739. The reversal of 21867734 is 43776812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21867739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9677 + ... + 11720.

It is an arithmetic number, because the mean of its divisors is an integer number (2375178).

Almost surely, 2^21867734 is an apocalyptic number.

21867734 is a deficient number, since it is larger than the sum of its proper divisors (16135114).

21867734 is a wasteful number, since it uses less digits than its factorization.

21867734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21479.

The product of its digits is 56448, while the sum is 38.

The square root of 21867734 is about 4676.2949008804. The cubic root of 21867734 is about 279.6412667813.

The spelling of 21867734 in words is "twenty-one million, eight hundred sixty-seven thousand, seven hundred thirty-four".