21123140232 has 32 divisors (see below), whose sum is σ = 52876212480. Its totient is φ = 7031931840.

The previous prime is 21123140231. The next prime is 21123140243. The reversal of 21123140232 is 23204132112.

It is a junction number, because it is equal to n+sod(n) for n = 21123140199 and 21123140208.

It is not an unprimeable number, because it can be changed into a prime (21123140231) 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, 550744 + ... + 587847.

It is an arithmetic number, because the mean of its divisors is an integer number (1652381640).

Almost surely, 2^21123140232 is an apocalyptic number.

It is an amenable number.

21123140232 is an abundant number, since it is smaller than the sum of its proper divisors (31753072248).

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

21123140232 is a wasteful number, since it uses less digits than its factorization.

21123140232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139373 (or 1139369 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21123140232 its reverse (23204132112), we get a palindrome (44327272344).

The spelling of 21123140232 in words is "twenty-one billion, one hundred twenty-three million, one hundred forty thousand, two hundred thirty-two".