21113343626432 has 56 divisors (see below), whose sum is σ = 42504934304160. Its totient is φ = 10403565240320.

The previous prime is 21113343626411. The next prime is 21113343626449. The reversal of 21113343626432 is 23462634331112.

It is a self number, because there is not a number n which added to its sum of digits gives 21113343626432.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9724544 + ... + 11695872.

Almost surely, 2^{21113343626432} 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 21113343626432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21252467152080).

21113343626432 is an abundant number, since it is smaller than the sum of its proper divisors (21391590677728).

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

21113343626432 is a wasteful number, since it uses less digits than its factorization.

21113343626432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1973769 (or 1973759 counting only the distinct ones).

The product of its digits is 373248, while the sum is 41.

Adding to 21113343626432 its reverse (23462634331112), we get a palindrome (44575977957544).

The spelling of 21113343626432 in words is "twenty-one trillion, one hundred thirteen billion, three hundred forty-three million, six hundred twenty-six thousand, four hundred thirty-two".