21126225231 has 24 divisors (see below), whose sum is σ = 30621427200. Its totient is φ = 14035401216.

The previous prime is 21126225203. The next prime is 21126225277. The reversal of 21126225231 is 13252262112.

21126225231 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 622 + 5 + 2 + 31 = 666.

It is not a de Polignac number, because 21126225231 - 2⁹ = 21126224719 is a prime.

It is a super-2 number, since 2×21126225231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21126225195 and 21126225204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21126220231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6123595 + ... + 6127043.

It is an arithmetic number, because the mean of its divisors is an integer number (1275892800).

Almost surely, 2^21126225231 is an apocalyptic number.

21126225231 is a deficient number, since it is larger than the sum of its proper divisors (9495201969).

21126225231 is a wasteful number, since it uses less digits than its factorization.

21126225231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5615 (or 5612 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

Adding to 21126225231 its reverse (13252262112), we get a palindrome (34378487343).

The spelling of 21126225231 in words is "twenty-one billion, one hundred twenty-six million, two hundred twenty-five thousand, two hundred thirty-one".