21136031460 has 60 divisors (see below), whose sum is σ = 66304518588. Its totient is φ = 5636274624.

The previous prime is 21136031443. The next prime is 21136031461. The reversal of 21136031460 is 6413063112.

21136031460 is a `hidden beast` number, since 2 + 1 + 13 + 603 + 1 + 46 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14336709696 + 6799321764 = 119736^2 + 82458^2 .

It is a tau number, because it is divible by the number of its divisors (60).

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 (21136031461) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6521847 + ... + 6525086.

Almost surely, 2^21136031460 is an apocalyptic number.

21136031460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21136031460 is an abundant number, since it is smaller than the sum of its proper divisors (45168487128).

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

21136031460 is a wasteful number, since it uses less digits than its factorization.

21136031460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13046954 (or 13046943 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

Adding to 21136031460 its reverse (6413063112), we get a palindrome (27549094572).

The spelling of 21136031460 in words is "twenty-one billion, one hundred thirty-six million, thirty-one thousand, four hundred sixty".