21958492 has 12 divisors (see below), whose sum is σ = 40687920. Its totient is φ = 10333376.

The previous prime is 21958477. The next prime is 21958523. The reversal of 21958492 is 29485912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161392 + ... + 161527.

It is an arithmetic number, because the mean of its divisors is an integer number (3390660).

Almost surely, 2^21958492 is an apocalyptic number.

It is an amenable number.

21958492 is a deficient number, since it is larger than the sum of its proper divisors (18729428).

21958492 is a wasteful number, since it uses less digits than its factorization.

21958492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322940 (or 322938 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 21958492 is about 4685.9889031025. The cubic root of 21958492 is about 280.0275993203.

The spelling of 21958492 in words is "twenty-one million, nine hundred fifty-eight thousand, four hundred ninety-two".