21355414445544 has 32 divisors (see below), whose sum is σ = 53391994175520. Its totient is φ = 7118010406976.

The previous prime is 21355414445509. The next prime is 21355414445581. The reversal of 21355414445544 is 44554441455312.

It is a super-2 number, since 2×21355414445544² (a number of 27 digits) contains 22 as substring.

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, 28438827 + ... + 29180090.

It is an arithmetic number, because the mean of its divisors is an integer number (1668499817985).

Almost surely, 2^{21355414445544} is an apocalyptic number.

21355414445544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21355414445544 is an abundant number, since it is smaller than the sum of its proper divisors (32036579729976).

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

21355414445544 is a wasteful number, since it uses less digits than its factorization.

21355414445544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57634369 (or 57634365 counting only the distinct ones).

The product of its digits is 15360000, while the sum is 51.

The spelling of 21355414445544 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred fourteen million, four hundred forty-five thousand, five hundred forty-four".