21409358056344 has 160 divisors (see below), whose sum is σ = 60694867537920. Its totient is φ = 7049732577984.

The previous prime is 21409358056309. The next prime is 21409358056399. The reversal of 21409358056344 is 44365085390412.

It is a happy number.

21409358056344 is a `hidden beast` number, since 2 + 1 + 4 + 0 + 9 + 3 + 580 + 56 + 3 + 4 + 4 = 666.

It is a super-2 number, since 2×21409358056344² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 795075409 + ... + 795102335.

It is an arithmetic number, because the mean of its divisors is an integer number (379342922112).

Almost surely, 2^{21409358056344} is an apocalyptic number.

21409358056344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21409358056344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30347433768960).

21409358056344 is an abundant number, since it is smaller than the sum of its proper divisors (39285509481576).

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

21409358056344 is a wasteful number, since it uses less digits than its factorization.

21409358056344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41811 (or 41798 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 54.

The spelling of 21409358056344 in words is "twenty-one trillion, four hundred nine billion, three hundred fifty-eight million, fifty-six thousand, three hundred forty-four".