21621415563162 has 16 divisors (see below), whose sum is σ = 48047590140480. Its totient is φ = 7207138521036.

The previous prime is 21621415563109. The next prime is 21621415563169. The reversal of 21621415563162 is 26136551412612.

21621415563162 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 1 + 4 + 1 + 5 + 5 + 631 + 6 + 2 = 666.

It is a super-2 number, since 2×21621415563162² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21621415563169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200198292198 + ... + 200198292305.

It is an arithmetic number, because the mean of its divisors is an integer number (3002974383780).

Almost surely, 2^{21621415563162} is an apocalyptic number.

21621415563162 is an abundant number, since it is smaller than the sum of its proper divisors (26426174577318).

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

21621415563162 is a wasteful number, since it uses less digits than its factorization.

21621415563162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400396584514 (or 400396584508 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

Adding to 21621415563162 its reverse (26136551412612), we get a palindrome (47757966975774).

The spelling of 21621415563162 in words is "twenty-one trillion, six hundred twenty-one billion, four hundred fifteen million, five hundred sixty-three thousand, one hundred sixty-two".