21504152415131 has 4 divisors (see below), whose sum is σ = 21628453874352. Its totient is φ = 21379850955912.

The previous prime is 21504152415103. The next prime is 21504152415157. The reversal of 21504152415131 is 13151425140512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21504152415131 - 2¹⁴ = 21504152398747 is a prime.

It is a super-2 number, since 2×21504152415131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21504152415091 and 21504152415100.

It is not an unprimeable number, because it can be changed into a prime (21504152415631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62150729351 + ... + 62150729696.

It is an arithmetic number, because the mean of its divisors is an integer number (5407113468588).

Almost surely, 2^{21504152415131} is an apocalyptic number.

21504152415131 is a deficient number, since it is larger than the sum of its proper divisors (124301459221).

21504152415131 is a wasteful number, since it uses less digits than its factorization.

21504152415131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124301459220.

The product of its (nonzero) digits is 24000, while the sum is 35.

Adding to 21504152415131 its reverse (13151425140512), we get a palindrome (34655577555643).

The spelling of 21504152415131 in words is "twenty-one trillion, five hundred four billion, one hundred fifty-two million, four hundred fifteen thousand, one hundred thirty-one".