21402311310 has 96 divisors (see below), whose sum is σ = 56989471968. Its totient is φ = 5569724160.

The previous prime is 21402311291. The next prime is 21402311363. The reversal of 21402311310 is 1311320412.

21402311310 is a `hidden beast` number, since 2 + 1 + 40 + 2 + 311 + 310 = 666.

It is a super-2 number, since 2×21402311310² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7479280 + ... + 7482140.

It is an arithmetic number, because the mean of its divisors is an integer number (593640333).

Almost surely, 2^21402311310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21402311310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28494735984).

21402311310 is an abundant number, since it is smaller than the sum of its proper divisors (35587160658).

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

21402311310 is a wasteful number, since it uses less digits than its factorization.

21402311310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4850 (or 4847 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21402311310 its reverse (1311320412), we get a palindrome (22713631722).

The spelling of 21402311310 in words is "twenty-one billion, four hundred two million, three hundred eleven thousand, three hundred ten".