21740899626520 has 32 divisors (see below), whose sum is σ = 51491604380400. Its totient is φ = 8238656700288.

The previous prime is 21740899626389. The next prime is 21740899626533. The reversal of 21740899626520 is 2562699804712.

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 7 ways as a sum of consecutive naturals, for example, 14303222679 + ... + 14303224198.

Almost surely, 2^{21740899626520} is an apocalyptic number.

21740899626520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21740899626520 is an abundant number, since it is smaller than the sum of its proper divisors (29750704753880).

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

21740899626520 is a wasteful number, since it uses less digits than its factorization.

21740899626520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28606446907 (or 28606446903 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 61.

The spelling of 21740899626520 in words is "twenty-one trillion, seven hundred forty billion, eight hundred ninety-nine million, six hundred twenty-six thousand, five hundred twenty".