21311020302 has 32 divisors (see below), whose sum is σ = 50073448320. Its totient is φ = 5961124320.

The previous prime is 21311020253. The next prime is 21311020309. The reversal of 21311020302 is 20302011312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311020309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12418152 + ... + 12419867.

It is an arithmetic number, because the mean of its divisors is an integer number (1564795260).

Almost surely, 2^21311020302 is an apocalyptic number.

21311020302 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21311020302 is an abundant number, since it is smaller than the sum of its proper divisors (28762428018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21311020302 is a wasteful number, since it uses less digits than its factorization.

21311020302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24838048.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21311020302 its reverse (20302011312), we get a palindrome (41613031614).

The spelling of 21311020302 in words is "twenty-one billion, three hundred eleven million, twenty thousand, three hundred two".