21513342131 has 8 divisors (see below), whose sum is σ = 21608867280. Its totient is φ = 21417982848.

The previous prime is 21513342113. The next prime is 21513342139. The reversal of 21513342131 is 13124331512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21513342131 is a prime.

It is a super-2 number, since 2×21513342131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21513342131.

It is not an unprimeable number, because it can be changed into a prime (21513342139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222215 + ... + 303983.

It is an arithmetic number, because the mean of its divisors is an integer number (2701108410).

Almost surely, 2^21513342131 is an apocalyptic number.

21513342131 is a deficient number, since it is larger than the sum of its proper divisors (95525149).

21513342131 is an equidigital number, since it uses as much as digits as its factorization.

21513342131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82933.

The product of its digits is 2160, while the sum is 26.

Adding to 21513342131 its reverse (13124331512), we get a palindrome (34637673643).

The spelling of 21513342131 in words is "twenty-one billion, five hundred thirteen million, three hundred forty-two thousand, one hundred thirty-one".