21136311625 has 32 divisors (see below), whose sum is σ = 30989702016. Its totient is φ = 14189400000.

The previous prime is 21136311601. The next prime is 21136311629. The reversal of 21136311625 is 52611363112.

It is not a de Polignac number, because 21136311625 - 2¹⁷ = 21136180553 is a prime.

It is a super-2 number, since 2×21136311625² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21136311629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 573351 + ... + 609100.

It is an arithmetic number, because the mean of its divisors is an integer number (968428188).

Almost surely, 2^21136311625 is an apocalyptic number.

21136311625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21136311625 is a deficient number, since it is larger than the sum of its proper divisors (9853390391).

21136311625 is a wasteful number, since it uses less digits than its factorization.

21136311625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182490 (or 1182480 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

Adding to 21136311625 its reverse (52611363112), we get a palindrome (73747674737).

The spelling of 21136311625 in words is "twenty-one billion, one hundred thirty-six million, three hundred eleven thousand, six hundred twenty-five".