21211331213310 has 128 divisors (see below), whose sum is σ = 58318237440000. Its totient is φ = 4836758814720.

The previous prime is 21211331213239. The next prime is 21211331213323. The reversal of 21211331213310 is 1331213311212.

It is a super-2 number, since 2×21211331213310² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 810786630 + ... + 810812790.

It is an arithmetic number, because the mean of its divisors is an integer number (455611230000).

Almost surely, 2^{21211331213310} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21211331213310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29159118720000).

21211331213310 is an abundant number, since it is smaller than the sum of its proper divisors (37106906226690).

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

21211331213310 is a wasteful number, since it uses less digits than its factorization.

21211331213310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35226.

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 21211331213310 its reverse (1331213311212), we get a palindrome (22542544524522).

The spelling of 21211331213310 in words is "twenty-one trillion, two hundred eleven billion, three hundred thirty-one million, two hundred thirteen thousand, three hundred ten".