21236204622660 has 192 divisors, whose sum is σ = 63353487052800. Its totient is φ = 5299590233088.

The previous prime is 21236204622601. The next prime is 21236204622713. The reversal of 21236204622660 is 6622640263212.

It is a happy 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, 1375483221 + ... + 1375498659.

It is an arithmetic number, because the mean of its divisors is an integer number (329966078400).

Almost surely, 2^{21236204622660} is an apocalyptic number.

21236204622660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21236204622660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31676743526400).

21236204622660 is an abundant number, since it is smaller than the sum of its proper divisors (42117282430140).

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

21236204622660 is a wasteful number, since it uses less digits than its factorization.

21236204622660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30090 (or 30088 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 42.

Adding to 21236204622660 its reverse (6622640263212), we get a palindrome (27858844885872).

The spelling of 21236204622660 in words is "twenty-one trillion, two hundred thirty-six billion, two hundred four million, six hundred twenty-two thousand, six hundred sixty".