21023122132 has 12 divisors (see below), whose sum is σ = 36977218740. Its totient is φ = 10458202496.

The previous prime is 21023122121. The next prime is 21023122151. The reversal of 21023122132 is 23122132012.

It can be written as a sum of positive squares in 2 ways, for example, as 18353746576 + 2669375556 = 135476^2 + 51666^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13338757 + ... + 13340332.

It is an arithmetic number, because the mean of its divisors is an integer number (3081434895).

Almost surely, 2^21023122132 is an apocalyptic number.

It is an amenable number.

21023122132 is a deficient number, since it is larger than the sum of its proper divisors (15954096608).

21023122132 is a wasteful number, since it uses less digits than its factorization.

21023122132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26679290 (or 26679288 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21023122132 its reverse (23122132012), we get a palindrome (44145254144).

The spelling of 21023122132 in words is "twenty-one billion, twenty-three million, one hundred twenty-two thousand, one hundred thirty-two".