21929398 has 8 divisors (see below), whose sum is σ = 33659208. Its totient is φ = 10709664.

The previous prime is 21929393. The next prime is 21929437. The reversal of 21929398 is 89392912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (43).

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, 127411 + ... + 127582.

It is an arithmetic number, because the mean of its divisors is an integer number (4207401).

Almost surely, 2^21929398 is an apocalyptic number.

21929398 is a deficient number, since it is larger than the sum of its proper divisors (11729810).

21929398 is a wasteful number, since it uses less digits than its factorization.

21929398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255038.

The product of its digits is 69984, while the sum is 43.

The square root of 21929398 is about 4682.8835133921. The cubic root of 21929398 is about 279.9038700616.

The spelling of 21929398 in words is "twenty-one million, nine hundred twenty-nine thousand, three hundred ninety-eight".