21311313317202 has 16 divisors (see below), whose sum is σ = 42622857129600. Its totient is φ = 7103732689872.

The previous prime is 21311313317201. The next prime is 21311313317219. The reversal of 21311313317202 is 20271331311312.

It is a self number, because there is not a number n which added to its sum of digits gives 21311313317202.

It is not an unprimeable number, because it can be changed into a prime (21311313317201) 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, 8390202 + ... + 10630997.

It is an arithmetic number, because the mean of its divisors is an integer number (2663928570600).

Almost surely, 2^{21311313317202} is an apocalyptic number.

21311313317202 is an abundant number, since it is smaller than the sum of its proper divisors (21311543812398).

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

21311313317202 is a wasteful number, since it uses less digits than its factorization.

21311313317202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19207937.

The product of its (nonzero) digits is 4536, while the sum is 30.

Adding to 21311313317202 its reverse (20271331311312), we get a palindrome (41582644628514).

The spelling of 21311313317202 in words is "twenty-one trillion, three hundred eleven billion, three hundred thirteen million, three hundred seventeen thousand, two hundred two".