21337617540 has 48 divisors (see below), whose sum is σ = 60336884160. Its totient is φ = 5633692800.

The previous prime is 21337617529. The next prime is 21337617547. The reversal of 21337617540 is 4571673312.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21337617547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1754470 + ... + 1766589.

It is an arithmetic number, because the mean of its divisors is an integer number (1257018420).

Almost surely, 2^21337617540 is an apocalyptic number.

21337617540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21337617540 is an abundant number, since it is smaller than the sum of its proper divisors (38999266620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21337617540 is a wasteful number, since it uses less digits than its factorization.

21337617540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3521172 (or 3521170 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 39.

The spelling of 21337617540 in words is "twenty-one billion, three hundred thirty-seven million, six hundred seventeen thousand, five hundred forty".