21960257492 has 48 divisors (see below), whose sum is σ = 40580652672. Its totient is φ = 10377628800.

The previous prime is 21960257477. The next prime is 21960257503. The reversal of 21960257492 is 29475206912.

It is a happy number.

It is a super-2 number, since 2×21960257492² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5173523 + ... + 5177765.

It is an arithmetic number, because the mean of its divisors is an integer number (845430264).

Almost surely, 2^21960257492 is an apocalyptic number.

It is an amenable number.

21960257492 is a deficient number, since it is larger than the sum of its proper divisors (18620395180).

21960257492 is a wasteful number, since it uses less digits than its factorization.

21960257492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4928 (or 4926 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 21960257492 in words is "twenty-one billion, nine hundred sixty million, two hundred fifty-seven thousand, four hundred ninety-two".