21313402 has 16 divisors (see below), whose sum is σ = 36712800. Its totient is φ = 9177840.

The previous prime is 21313379. The next prime is 21313429. The reversal of 21313402 is 20431312.

It is a happy number.

It is a super-2 number, since 2×21313402² = 908522209627208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25077 + ... + 25912.

It is an arithmetic number, because the mean of its divisors is an integer number (2294550).

Almost surely, 2^21313402 is an apocalyptic number.

21313402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21313402 is a deficient number, since it is larger than the sum of its proper divisors (15399398).

21313402 is a wasteful number, since it uses less digits than its factorization.

21313402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51021.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21313402 is about 4616.6440191984. The cubic root of 21313402 is about 277.2581102358.

Adding to 21313402 its reverse (20431312), we get a palindrome (41744714).

The spelling of 21313402 in words is "twenty-one million, three hundred thirteen thousand, four hundred two".