21910436 has 12 divisors (see below), whose sum is σ = 38384640. Its totient is φ = 10943400.

The previous prime is 21910409. The next prime is 21910453. The reversal of 21910436 is 63401912.

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, 2225 + ... + 6983.

It is an arithmetic number, because the mean of its divisors is an integer number (3198720).

Almost surely, 2^21910436 is an apocalyptic number.

It is an amenable number.

21910436 is a deficient number, since it is larger than the sum of its proper divisors (16474204).

21910436 is a wasteful number, since it uses less digits than its factorization.

21910436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5914 (or 5912 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21910436 is about 4680.8584682727. The cubic root of 21910436 is about 279.8231706628.

The spelling of 21910436 in words is "twenty-one million, nine hundred ten thousand, four hundred thirty-six".