21929396 has 12 divisors (see below), whose sum is σ = 40045152. Its totient is φ = 10487928.

The previous prime is 21929393. The next prime is 21929437. The reversal of 21929396 is 69392912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21929393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119090 + ... + 119273.

It is an arithmetic number, because the mean of its divisors is an integer number (3337096).

Almost surely, 2^21929396 is an apocalyptic number.

It is an amenable number.

21929396 is a deficient number, since it is larger than the sum of its proper divisors (18115756).

21929396 is a wasteful number, since it uses less digits than its factorization.

21929396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238390 (or 238388 counting only the distinct ones).

The product of its digits is 52488, while the sum is 41.

The square root of 21929396 is about 4682.8832998485. The cubic root of 21929396 is about 279.9038615523.

The spelling of 21929396 in words is "twenty-one million, nine hundred twenty-nine thousand, three hundred ninety-six".