21222460137 has 4 divisors (see below), whose sum is σ = 28296613520. Its totient is φ = 14148306756.

The previous prime is 21222460117. The next prime is 21222460177. The reversal of 21222460137 is 73106422212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21222460137 - 2⁶ = 21222460073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222460117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3537076687 + ... + 3537076692.

It is an arithmetic number, because the mean of its divisors is an integer number (7074153380).

Almost surely, 2^21222460137 is an apocalyptic number.

It is an amenable number.

21222460137 is a deficient number, since it is larger than the sum of its proper divisors (7074153383).

21222460137 is an equidigital number, since it uses as much as digits as its factorization.

21222460137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7074153382.

The product of its (nonzero) digits is 8064, while the sum is 30.

Adding to 21222460137 its reverse (73106422212), we get a palindrome (94328882349).

The spelling of 21222460137 in words is "twenty-one billion, two hundred twenty-two million, four hundred sixty thousand, one hundred thirty-seven".