21621411422364 has 96 divisors (see below), whose sum is σ = 56428123530240. Its totient is φ = 6397745760000.

The previous prime is 21621411422363. The next prime is 21621411422407. The reversal of 21621411422364 is 46322411412612.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21621411422363) 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, 8384932 + ... + 10655979.

It is an arithmetic number, because the mean of its divisors is an integer number (587792953440).

Almost surely, 2^{21621411422364} is an apocalyptic number.

It is an amenable number.

21621411422364 is an abundant number, since it is smaller than the sum of its proper divisors (34806712107876).

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

21621411422364 is a wasteful number, since it uses less digits than its factorization.

21621411422364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19041211 (or 19041209 counting only the distinct ones).

The product of its digits is 110592, while the sum is 39.

Adding to 21621411422364 its reverse (46322411412612), we get a palindrome (67943822834976).

The spelling of 21621411422364 in words is "twenty-one trillion, six hundred twenty-one billion, four hundred eleven million, four hundred twenty-two thousand, three hundred sixty-four".