21001311310 has 48 divisors (see below), whose sum is σ = 44468358480. Its totient is φ = 7119530880.

The previous prime is 21001311283. The next prime is 21001311323. The reversal of 21001311310 is 1311310012.

It is a super-2 number, since 2×21001311310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 197176 + ... + 284395.

It is an arithmetic number, because the mean of its divisors is an integer number (926424135).

Almost surely, 2^21001311310 is an apocalyptic number.

21001311310 is an abundant number, since it is smaller than the sum of its proper divisors (23467047170).

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

21001311310 is a wasteful number, since it uses less digits than its factorization.

21001311310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481681 (or 481674 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 21001311310 its reverse (1311310012), we get a palindrome (22312621322).

The spelling of 21001311310 in words is "twenty-one billion, one million, three hundred eleven thousand, three hundred ten".