21222026215560 has 48 divisors (see below), whose sum is σ = 68971585201740. Its totient is φ = 5659206990720.

The previous prime is 21222026215547. The next prime is 21222026215561. The reversal of 21222026215560 is 6551262022212.

21222026215560 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 20 + 2 + 62 + 15 + 560 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21221998146756 + 28068804 = 4606734^2 + 5298^2 .

It is a super-2 number, since 2×21222026215560² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21222026215561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29475036051 + ... + 29475036770.

Almost surely, 2^{21222026215560} is an apocalyptic number.

21222026215560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222026215560 is an abundant number, since it is smaller than the sum of its proper divisors (47749558986180).

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

21222026215560 is a wasteful number, since it uses less digits than its factorization.

21222026215560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58950072838 (or 58950072831 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

Adding to 21222026215560 its reverse (6551262022212), we get a palindrome (27773288237772).

The spelling of 21222026215560 in words is "twenty-one trillion, two hundred twenty-two billion, twenty-six million, two hundred fifteen thousand, five hundred sixty".