21914902 has 4 divisors (see below), whose sum is σ = 32872356. Its totient is φ = 10957450.

The previous prime is 21914891. The next prime is 21914903. The reversal of 21914902 is 20941912.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent 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 as a sum of consecutive naturals, namely, 5478724 + ... + 5478727.

It is an arithmetic number, because the mean of its divisors is an integer number (8218089).

Almost surely, 2^21914902 is an apocalyptic number.

21914902 is a deficient number, since it is larger than the sum of its proper divisors (10957454).

21914902 is a wasteful number, since it uses less digits than its factorization.

21914902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10957453.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 21914902 is about 4681.3354932113. The cubic root of 21914902 is about 279.8421814724.

The spelling of 21914902 in words is "twenty-one million, nine hundred fourteen thousand, nine hundred two".