21313130 has 16 divisors (see below), whose sum is σ = 38416680. Its totient is φ = 8513472.

The previous prime is 21313129. The next prime is 21313133. The reversal of 21313130 is 3131312.

It can be written as a sum of positive squares in 4 ways, for example, as 18567481 + 2745649 = 4309^2 + 1657^2 .

It is not an unprimeable number, because it can be changed into a prime (21313133) 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, 11936 + ... + 13604.

Almost surely, 2^21313130 is an apocalyptic number.

21313130 is a deficient number, since it is larger than the sum of its proper divisors (17103550).

21313130 is a wasteful number, since it uses less digits than its factorization.

21313130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2953.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 21313130 is about 4616.6145604761. The cubic root of 21313130 is about 277.2569307818.

Adding to 21313130 its reverse (3131312), we get a palindrome (24444442).

The spelling of 21313130 in words is "twenty-one million, three hundred thirteen thousand, one hundred thirty".