21122225415 has 80 divisors (see below), whose sum is σ = 38821055328. Its totient is φ = 10983009024.

The previous prime is 21122225407. The next prime is 21122225419. The reversal of 21122225415 is 51452222112.

21122225415 is a `hidden beast` number, since 2 + 1 + 1 + 22 + 225 + 415 = 666.

It is not a de Polignac number, because 21122225415 - 2³ = 21122225407 is a prime.

It is a super-2 number, since 2×21122225415² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122225419) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3495777 + ... + 3501813.

Almost surely, 2^21122225415 is an apocalyptic number.

21122225415 is a deficient number, since it is larger than the sum of its proper divisors (17698829913).

21122225415 is a wasteful number, since it uses less digits than its factorization.

21122225415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6270 (or 6261 counting only the distinct ones).

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

Adding to 21122225415 its reverse (51452222112), we get a palindrome (72574447527).

The spelling of 21122225415 in words is "twenty-one billion, one hundred twenty-two million, two hundred twenty-five thousand, four hundred fifteen".