21430553131 has 16 divisors (see below), whose sum is σ = 24333164800. Its totient is φ = 18710479008.

The previous prime is 21430553119. The next prime is 21430553147. The reversal of 21430553131 is 13135503412.

It is a happy number.

It is not a de Polignac number, because 21430553131 - 2⁷ = 21430553003 is a prime.

It is a super-2 number, since 2×21430553131² (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 21430553131.

It is not an unprimeable number, because it can be changed into a prime (21430553171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82810 + ... + 222976.

It is an arithmetic number, because the mean of its divisors is an integer number (1520822800).

Almost surely, 2^21430553131 is an apocalyptic number.

21430553131 is a deficient number, since it is larger than the sum of its proper divisors (2902611669).

21430553131 is a wasteful number, since it uses less digits than its factorization.

21430553131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140818.

The product of its (nonzero) digits is 5400, while the sum is 28.

The spelling of 21430553131 in words is "twenty-one billion, four hundred thirty million, five hundred fifty-three thousand, one hundred thirty-one".