21122225451 has 24 divisors (see below), whose sum is σ = 31021295760. Its totient is φ = 13845614400.

The previous prime is 21122225431. The next prime is 21122225459. The reversal of 21122225451 is 15452222112.

21122225451 is a `hidden beast` number, since 2 + 112 + 2 + 2 + 2 + 545 + 1 = 666.

It is not a de Polignac number, because 21122225451 - 2⁵ = 21122225419 is a prime.

It is a super-2 number, since 2×21122225451² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122225459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2069581 + ... + 2079761.

It is an arithmetic number, because the mean of its divisors is an integer number (1292553990).

Almost surely, 2^21122225451 is an apocalyptic number.

21122225451 is a deficient number, since it is larger than the sum of its proper divisors (9899070309).

21122225451 is a wasteful number, since it uses less digits than its factorization.

21122225451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14027 (or 14024 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

Adding to 21122225451 its reverse (15452222112), we get a palindrome (36574447563).

The spelling of 21122225451 in words is "twenty-one billion, one hundred twenty-two million, two hundred twenty-five thousand, four hundred fifty-one".