21222741537 has 12 divisors (see below), whose sum is σ = 32458310820. Its totient is φ = 13316229888.

The previous prime is 21222741511. The next prime is 21222741541. The reversal of 21222741537 is 73514722212.

21222741537 is a `hidden beast` number, since 2 + 12 + 227 + 415 + 3 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7313841441 + 13908900096 = 85521^2 + 117936^2 .

It is not a de Polignac number, because 21222741537 - 2¹⁶ = 21222676001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222741037) 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, 69355212 + ... + 69355517.

It is an arithmetic number, because the mean of its divisors is an integer number (2704859235).

Almost surely, 2^21222741537 is an apocalyptic number.

It is an amenable number.

21222741537 is a deficient number, since it is larger than the sum of its proper divisors (11235569283).

21222741537 is a wasteful number, since it uses less digits than its factorization.

21222741537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138710752 (or 138710749 counting only the distinct ones).

The product of its digits is 47040, while the sum is 36.

The spelling of 21222741537 in words is "twenty-one billion, two hundred twenty-two million, seven hundred forty-one thousand, five hundred thirty-seven".