21337994548 has 54 divisors (see below), whose sum is σ = 41183284898. Its totient is φ = 9616403040.

The previous prime is 21337994507. The next prime is 21337994599. The reversal of 21337994548 is 84549973312.

It can be written as a sum of positive squares in only one way, i.e., 14772457764 + 6565536784 = 121542^2 + 81028^2 .

It is a super-2 number, since 2×21337994548² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 49507893 + ... + 49508323.

Almost surely, 2^21337994548 is an apocalyptic number.

It is an amenable number.

21337994548 is a deficient number, since it is larger than the sum of its proper divisors (19845290350).

21337994548 is an equidigital number, since it uses as much as digits as its factorization.

21337994548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973 (or 493 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 55.

The spelling of 21337994548 in words is "twenty-one billion, three hundred thirty-seven million, nine hundred ninety-four thousand, five hundred forty-eight".