21122310231 has 24 divisors (see below), whose sum is σ = 34057685376. Its totient is φ = 12503690640.

The previous prime is 21122310197. The next prime is 21122310233. The reversal of 21122310231 is 13201322112.

21122310231 is a `hidden beast` number, since 2 + 1 + 122 + 310 + 231 = 666.

It is not a de Polignac number, because 21122310231 - 2¹⁰ = 21122309207 is a prime.

It is a super-2 number, since 2×21122310231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122310233) 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, 2476635 + ... + 2485148.

It is an arithmetic number, because the mean of its divisors is an integer number (1419070224).

Almost surely, 2^21122310231 is an apocalyptic number.

21122310231 is a deficient number, since it is larger than the sum of its proper divisors (12935375145).

21122310231 is a wasteful number, since it uses less digits than its factorization.

21122310231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4961843 (or 4961840 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21122310231 its reverse (13201322112), we get a palindrome (34323632343).

The spelling of 21122310231 in words is "twenty-one billion, one hundred twenty-two million, three hundred ten thousand, two hundred thirty-one".