21969613918068 has 96 divisors (see below), whose sum is σ = 54703388342400. Its totient is φ = 6842265882624.

The previous prime is 21969613918039. The next prime is 21969613918127. The reversal of 21969613918068 is 86081931696912.

It is a junction number, because it is equal to n+sod(n) for n = 21969613917993 and 21969613918011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 304366030 + ... + 304438202.

It is an arithmetic number, because the mean of its divisors is an integer number (569826961900).

Almost surely, 2^{21969613918068} 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 21969613918068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27351694171200).

21969613918068 is an abundant number, since it is smaller than the sum of its proper divisors (32733774424332).

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

21969613918068 is a wasteful number, since it uses less digits than its factorization.

21969613918068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90561 (or 90559 counting only the distinct ones).

The product of its (nonzero) digits is 60466176, while the sum is 69.

The spelling of 21969613918068 in words is "twenty-one trillion, nine hundred sixty-nine billion, six hundred thirteen million, nine hundred eighteen thousand, sixty-eight".