21124545292 has 12 divisors (see below), whose sum is σ = 37869611976. Its totient is φ = 10304656160.

The previous prime is 21124545289. The next prime is 21124545311. The reversal of 21124545292 is 29254542112.

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, 64403938 + ... + 64404265.

It is an arithmetic number, because the mean of its divisors is an integer number (3155800998).

Almost surely, 2^21124545292 is an apocalyptic number.

It is an amenable number.

21124545292 is a deficient number, since it is larger than the sum of its proper divisors (16745066684).

21124545292 is a wasteful number, since it uses less digits than its factorization.

21124545292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128808248 (or 128808246 counting only the distinct ones).

The product of its digits is 57600, while the sum is 37.

The spelling of 21124545292 in words is "twenty-one billion, one hundred twenty-four million, five hundred forty-five thousand, two hundred ninety-two".