21373822165710 has 128 divisors (see below), whose sum is σ = 59517692881920. Its totient is φ = 4811124916224.

The previous prime is 21373822165649. The next prime is 21373822165711. The reversal of 21373822165710 is 1756122837312.

It is a super-2 number, since 2×21373822165710² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21373822165710.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21373822165711) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 48420276 + ... + 48859704.

It is an arithmetic number, because the mean of its divisors is an integer number (464981975640).

Almost surely, 2^{21373822165710} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21373822165710, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29758846440960).

21373822165710 is an abundant number, since it is smaller than the sum of its proper divisors (38143870716210).

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

21373822165710 is a wasteful number, since it uses less digits than its factorization.

21373822165710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442970.

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 21373822165710 in words is "twenty-one trillion, three hundred seventy-three billion, eight hundred twenty-two million, one hundred sixty-five thousand, seven hundred ten".