21436405131 has 8 divisors (see below), whose sum is σ = 30086182720. Its totient is φ = 13538782152.

The previous prime is 21436405127. The next prime is 21436405267. The reversal of 21436405131 is 13150463412.

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

It is not a de Polignac number, because 21436405131 - 2² = 21436405127 is a prime.

It is a super-2 number, since 2×21436405131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21436405031) 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, 188038585 + ... + 188038698.

It is an arithmetic number, because the mean of its divisors is an integer number (3760772840).

Almost surely, 2^21436405131 is an apocalyptic number.

21436405131 is a deficient number, since it is larger than the sum of its proper divisors (8649777589).

21436405131 is a wasteful number, since it uses less digits than its factorization.

21436405131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376077305.

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 21436405131 its reverse (13150463412), we get a palindrome (34586868543).

The spelling of 21436405131 in words is "twenty-one billion, four hundred thirty-six million, four hundred five thousand, one hundred thirty-one".