21124133131 has 8 divisors (see below), whose sum is σ = 21309203664. Its totient is φ = 20939842560.

The previous prime is 21124133099. The next prime is 21124133137. The reversal of 21124133131 is 13133142112.

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

It is a cyclic number.

It is not a de Polignac number, because 21124133131 - 2⁵ = 21124133099 is a prime.

It is a super-2 number, since 2×21124133131² (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 (21124133137) 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, 140521 + ... + 248986.

It is an arithmetic number, because the mean of its divisors is an integer number (2663650458).

Almost surely, 2^21124133131 is an apocalyptic number.

21124133131 is a deficient number, since it is larger than the sum of its proper divisors (185070533).

21124133131 is a wasteful number, since it uses less digits than its factorization.

21124133131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389981.

The product of its digits is 432, while the sum is 22.

Adding to 21124133131 its reverse (13133142112), we get a palindrome (34257275243).

The spelling of 21124133131 in words is "twenty-one billion, one hundred twenty-four million, one hundred thirty-three thousand, one hundred thirty-one".