21245255595392 has 128 divisors (see below), whose sum is σ = 45667488960000. Its totient is φ = 9808103448576.

The previous prime is 21245255595379. The next prime is 21245255595419. The reversal of 21245255595392 is 29359555254212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62353109 + ... + 62692907.

It is an arithmetic number, because the mean of its divisors is an integer number (356777257500).

Almost surely, 2^{21245255595392} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21245255595392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22833744480000).

21245255595392 is an abundant number, since it is smaller than the sum of its proper divisors (24422233364608).

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

21245255595392 is a wasteful number, since it uses less digits than its factorization.

21245255595392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340376 (or 340364 counting only the distinct ones).

The product of its digits is 48600000, while the sum is 59.

The spelling of 21245255595392 in words is "twenty-one trillion, two hundred forty-five billion, two hundred fifty-five million, five hundred ninety-five thousand, three hundred ninety-two".