21611492 has 24 divisors (see below), whose sum is σ = 44041536. Its totient is φ = 9086688.

The previous prime is 21611461. The next prime is 21611519. The reversal of 21611492 is 29411612.

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, 5798 + ... + 8765.

It is an arithmetic number, because the mean of its divisors is an integer number (1835064).

Almost surely, 2^21611492 is an apocalyptic number.

It is an amenable number.

21611492 is an abundant number, since it is smaller than the sum of its proper divisors (22430044).

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

21611492 is a wasteful number, since it uses less digits than its factorization.

21611492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14627 (or 14625 counting only the distinct ones).

The product of its digits is 864, while the sum is 26.

The square root of 21611492 is about 4648.8161933981. The cubic root of 21611492 is about 278.5447112037.

The spelling of 21611492 in words is "twenty-one million, six hundred eleven thousand, four hundred ninety-two".