21131132231 has 8 divisors (see below), whose sum is σ = 23280384528. Its totient is φ = 19019920000.

The previous prime is 21131132221. The next prime is 21131132233. The reversal of 21131132231 is 13223113112.

It is a happy number.

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 21131132231 - 2²² = 21126937927 is a prime.

It is a super-2 number, since 2×21131132231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131132233) 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, 9508850 + ... + 9511071.

It is an arithmetic number, because the mean of its divisors is an integer number (2910048066).

Almost surely, 2^21131132231 is an apocalyptic number.

21131132231 is a deficient number, since it is larger than the sum of its proper divisors (2149252297).

21131132231 is a wasteful number, since it uses less digits than its factorization.

21131132231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19020033.

The product of its digits is 216, while the sum is 20.

Adding to 21131132231 its reverse (13223113112), we get a palindrome (34354245343).

The spelling of 21131132231 in words is "twenty-one billion, one hundred thirty-one million, one hundred thirty-two thousand, two hundred thirty-one".