21230131122 has 24 divisors (see below), whose sum is σ = 46628738364. Its totient is φ = 6979768704.

The previous prime is 21230131121. The next prime is 21230131127. The reversal of 21230131122 is 22113103212.

21230131122 is a `hidden beast` number, since 212 + 301 + 31 + 122 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21185093601 + 45037521 = 145551^2 + 6711^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21230131095 and 21230131104.

It is not an unprimeable number, because it can be changed into a prime (21230131121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8077123 + ... + 8079750.

Almost surely, 2^21230131122 is an apocalyptic number.

21230131122 is an abundant number, since it is smaller than the sum of its proper divisors (25398607242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21230131122 is a wasteful number, since it uses less digits than its factorization.

21230131122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16156954 (or 16156951 counting only the distinct ones).

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

Adding to 21230131122 its reverse (22113103212), we get a palindrome (43343234334).

The spelling of 21230131122 in words is "twenty-one billion, two hundred thirty million, one hundred thirty-one thousand, one hundred twenty-two".