21930158 has 8 divisors (see below), whose sum is σ = 32948328. Its totient is φ = 10947384.

The previous prime is 21930157. The next prime is 21930269. The reversal of 21930158 is 85103912.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21930158.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21930157) 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, 7241 + ... + 9812.

It is an arithmetic number, because the mean of its divisors is an integer number (4118541).

Almost surely, 2^21930158 is an apocalyptic number.

21930158 is a deficient number, since it is larger than the sum of its proper divisors (11018170).

21930158 is a wasteful number, since it uses less digits than its factorization.

21930158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17698.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 21930158 is about 4682.9646592730. The cubic root of 21930158 is about 279.9071035366.

The spelling of 21930158 in words is "twenty-one million, nine hundred thirty thousand, one hundred fifty-eight".