21706868484 has 288 divisors, whose sum is σ = 67954360320. Its totient is φ = 5968468800.

The previous prime is 21706868479. The next prime is 21706868509. The reversal of 21706868484 is 48486860712.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21706868484.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 50363749 + ... + 50364179.

It is an arithmetic number, because the mean of its divisors is an integer number (235952640).

Almost surely, 2^21706868484 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 21706868484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33977180160).

21706868484 is an abundant number, since it is smaller than the sum of its proper divisors (46247491836).

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

21706868484 is a wasteful number, since it uses less digits than its factorization.

21706868484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 54.

The spelling of 21706868484 in words is "twenty-one billion, seven hundred six million, eight hundred sixty-eight thousand, four hundred eighty-four".