21546634 has 16 divisors (see below), whose sum is σ = 32895072. Its totient is φ = 10583248.

The previous prime is 21546587. The next prime is 21546641. The reversal of 21546634 is 43664512.

It is a junction number, because it is equal to n+sod(n) for n = 21546596 and 21546605.

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, 48417 + ... + 48859.

It is an arithmetic number, because the mean of its divisors is an integer number (2055942).

Almost surely, 2^21546634 is an apocalyptic number.

21546634 is a deficient number, since it is larger than the sum of its proper divisors (11348438).

21546634 is a wasteful number, since it uses less digits than its factorization.

21546634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821.

The product of its digits is 17280, while the sum is 31.

The square root of 21546634 is about 4641.8351974192. The cubic root of 21546634 is about 278.2657862151.

The spelling of 21546634 in words is "twenty-one million, five hundred forty-six thousand, six hundred thirty-four".