21914906 has 24 divisors (see below), whose sum is σ = 37156320. Its totient is φ = 9671376.

The previous prime is 21914903. The next prime is 21914927. The reversal of 21914906 is 60941912.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21914903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6365 + ... + 9183.

It is an arithmetic number, because the mean of its divisors is an integer number (1548180).

Almost surely, 2^21914906 is an apocalyptic number.

21914906 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21914906 is a deficient number, since it is larger than the sum of its proper divisors (15241414).

21914906 is a wasteful number, since it uses less digits than its factorization.

21914906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2870 (or 2857 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 21914906 is about 4681.3359204398. The cubic root of 21914906 is about 279.8421984984.

The spelling of 21914906 in words is "twenty-one million, nine hundred fourteen thousand, nine hundred six".