21311302 has 16 divisors (see below), whose sum is σ = 34044192. Its totient is φ = 9970560.

The previous prime is 21311261. The next prime is 21311347. The reversal of 21311302 is 20311312.

It is a congruent number.

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, 4423 + ... + 7885.

It is an arithmetic number, because the mean of its divisors is an integer number (2127762).

Almost surely, 2^21311302 is an apocalyptic number.

21311302 is a deficient number, since it is larger than the sum of its proper divisors (12732890).

21311302 is a wasteful number, since it uses less digits than its factorization.

21311302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3663.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21311302 is about 4616.4165756569. The cubic root of 21311302 is about 277.2490038973.

Adding to 21311302 its reverse (20311312), we get a palindrome (41622614).

The spelling of 21311302 in words is "twenty-one million, three hundred eleven thousand, three hundred two".