21130694 has 16 divisors (see below), whose sum is σ = 36142848. Its totient is φ = 9178752.

The previous prime is 21130667. The next prime is 21130699. The reversal of 21130694 is 49603112.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23462 + ... + 24345.

It is an arithmetic number, because the mean of its divisors is an integer number (2258928).

Almost surely, 2^21130694 is an apocalyptic number.

21130694 is a deficient number, since it is larger than the sum of its proper divisors (15012154).

21130694 is a wasteful number, since it uses less digits than its factorization.

21130694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47839.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21130694 is about 4596.8134615188. The cubic root of 21130694 is about 276.4635754104.

The spelling of 21130694 in words is "twenty-one million, one hundred thirty thousand, six hundred ninety-four".