21122340237 has 12 divisors (see below), whose sum is σ = 31836571104. Its totient is φ = 13469318280.

The previous prime is 21122340229. The next prime is 21122340247. The reversal of 21122340237 is 73204322112.

21122340237 is a `hidden beast` number, since 2 + 1 + 1 + 223 + 402 + 37 = 666.

It is not a de Polignac number, because 21122340237 - 2³ = 21122340229 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21122340237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122340247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51019939 + ... + 51020352.

It is an arithmetic number, because the mean of its divisors is an integer number (2653047592).

Almost surely, 2^21122340237 is an apocalyptic number.

It is an amenable number.

21122340237 is a deficient number, since it is larger than the sum of its proper divisors (10714230867).

21122340237 is a wasteful number, since it uses less digits than its factorization.

21122340237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102040320 (or 102040317 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

Adding to 21122340237 its reverse (73204322112), we get a palindrome (94326662349).

The spelling of 21122340237 in words is "twenty-one billion, one hundred twenty-two million, three hundred forty thousand, two hundred thirty-seven".