21954236 has 24 divisors (see below), whose sum is σ = 40427520. Its totient is φ = 10411632.

The previous prime is 21954227. The next prime is 21954241. The reversal of 21954236 is 63245912.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10745 + ... + 12623.

It is an arithmetic number, because the mean of its divisors is an integer number (1684480).

Almost surely, 2^21954236 is an apocalyptic number.

It is an amenable number.

21954236 is a deficient number, since it is larger than the sum of its proper divisors (18473284).

21954236 is a wasteful number, since it uses less digits than its factorization.

21954236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2033 (or 2031 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 21954236 is about 4685.5347613693. The cubic root of 21954236 is about 280.0095064800.

The spelling of 21954236 in words is "twenty-one million, nine hundred fifty-four thousand, two hundred thirty-six".