21413124225 has 48 divisors (see below), whose sum is σ = 39388550400. Its totient is φ = 11405280960.

The previous prime is 21413124221. The next prime is 21413124259. The reversal of 21413124225 is 52242131412.

21413124225 is a `hidden beast` number, since 2 + 1 + 413 + 1 + 24 + 225 = 666.

It is not a de Polignac number, because 21413124225 - 2² = 21413124221 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (21413124221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 501256 + ... + 542294.

It is an arithmetic number, because the mean of its divisors is an integer number (820594800).

Almost surely, 2^21413124225 is an apocalyptic number.

21413124225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21413124225 is a deficient number, since it is larger than the sum of its proper divisors (17975426175).

21413124225 is a wasteful number, since it uses less digits than its factorization.

21413124225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41831 (or 41820 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

Adding to 21413124225 its reverse (52242131412), we get a palindrome (73655255637).

The spelling of 21413124225 in words is "twenty-one billion, four hundred thirteen million, one hundred twenty-four thousand, two hundred twenty-five".