21930106 has 32 divisors (see below), whose sum is σ = 37158912. Its totient is φ = 9621360.

The previous prime is 21930101. The next prime is 21930107. The reversal of 21930106 is 60103912.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (21930101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131235 + ... + 131401.

It is an arithmetic number, because the mean of its divisors is an integer number (1161216).

Almost surely, 2^21930106 is an apocalyptic number.

21930106 is a deficient number, since it is larger than the sum of its proper divisors (15228806).

21930106 is a wasteful number, since it uses less digits than its factorization.

21930106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 21930106 is about 4682.9591072312. The cubic root of 21930106 is about 279.9068823012.

The spelling of 21930106 in words is "twenty-one million, nine hundred thirty thousand, one hundred six".