21302120310 has 64 divisors (see below), whose sum is σ = 52566119424. Its totient is φ = 5521478400.

The previous prime is 21302120299. The next prime is 21302120311. The reversal of 21302120310 is 1302120312.

It is a super-2 number, since 2×21302120310² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21302120310.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302120311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 301377 + ... + 365283.

It is an arithmetic number, because the mean of its divisors is an integer number (821345616).

Almost surely, 2^21302120310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21302120310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26283059712).

21302120310 is an abundant number, since it is smaller than the sum of its proper divisors (31263999114).

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

21302120310 is a wasteful number, since it uses less digits than its factorization.

21302120310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64229.

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

Adding to 21302120310 its reverse (1302120312), we get a palindrome (22604240622).

The spelling of 21302120310 in words is "twenty-one billion, three hundred two million, one hundred twenty thousand, three hundred ten".