21225112045515 has 112 divisors (see below), whose sum is σ = 43701900899328. Its totient is φ = 9689840612928.

The previous prime is 21225112045507. The next prime is 21225112045573. The reversal of 21225112045515 is 51554021152212.

21225112045515 is a `hidden beast` number, since 2 + 1 + 2 + 25 + 112 + 0 + 4 + 5 + 515 = 666.

It is not a de Polignac number, because 21225112045515 - 2³ = 21225112045507 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21225112045515.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 18397842 + ... + 19517448.

It is an arithmetic number, because the mean of its divisors is an integer number (390195543744).

Almost surely, 2^{21225112045515} is an apocalyptic number.

21225112045515 is an abundant number, since it is smaller than the sum of its proper divisors (22476788853813).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21225112045515 is an equidigital number, since it uses as much as digits as its factorization.

21225112045515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120380 (or 1120365 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 36.

Adding to 21225112045515 its reverse (51554021152212), we get a palindrome (72779133197727).

The spelling of 21225112045515 in words is "twenty-one trillion, two hundred twenty-five billion, one hundred twelve million, forty-five thousand, five hundred fifteen".