21493773124 has 12 divisors (see below), whose sum is σ = 37901234448. Its totient is φ = 10664849000.

The previous prime is 21493773121. The next prime is 21493773137. The reversal of 21493773124 is 42137739412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21493773121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20508802 + ... + 20509849.

It is an arithmetic number, because the mean of its divisors is an integer number (3158436204).

Almost surely, 2^21493773124 is an apocalyptic number.

It is an amenable number.

21493773124 is a deficient number, since it is larger than the sum of its proper divisors (16407461324).

21493773124 is a wasteful number, since it uses less digits than its factorization.

21493773124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41018786 (or 41018784 counting only the distinct ones).

The product of its digits is 254016, while the sum is 43.

The spelling of 21493773124 in words is "twenty-one billion, four hundred ninety-three million, seven hundred seventy-three thousand, one hundred twenty-four".