21122225751 has 16 divisors (see below), whose sum is σ = 31714311168. Its totient is φ = 12388401600.

The previous prime is 21122225669. The next prime is 21122225771. The reversal of 21122225751 is 15752222112.

It is not a de Polignac number, because 21122225751 - 2⁷ = 21122225623 is a prime.

It is a super-2 number, since 2×21122225751² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122225771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10322646 + ... + 10324691.

It is an arithmetic number, because the mean of its divisors is an integer number (1982144448).

Almost surely, 2^21122225751 is an apocalyptic number.

21122225751 is a deficient number, since it is larger than the sum of its proper divisors (10592085417).

21122225751 is a wasteful number, since it uses less digits than its factorization.

21122225751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20647382.

The product of its digits is 5600, while the sum is 30.

Adding to 21122225751 its reverse (15752222112), we get a palindrome (36874447863).

The spelling of 21122225751 in words is "twenty-one billion, one hundred twenty-two million, two hundred twenty-five thousand, seven hundred fifty-one".