21230120232 has 24 divisors (see below), whose sum is σ = 57498242490. Its totient is φ = 7076706720.

The previous prime is 21230120203. The next prime is 21230120237. The reversal of 21230120232 is 23202103212.

It can be written as a sum of positive squares in only one way, i.e., 20458725156 + 771395076 = 143034^2 + 27774^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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

It is not an unprimeable number, because it can be changed into a prime (21230120237) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 147431319 + ... + 147431462.

Almost surely, 2^21230120232 is an apocalyptic number.

It is an amenable number.

21230120232 is an abundant number, since it is smaller than the sum of its proper divisors (36268122258).

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

21230120232 is a wasteful number, since it uses less digits than its factorization.

21230120232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294862793 (or 294862786 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21230120232 its reverse (23202103212), we get a palindrome (44432223444).

The spelling of 21230120232 in words is "twenty-one billion, two hundred thirty million, one hundred twenty thousand, two hundred thirty-two".