21697710030 has 128 divisors (see below), whose sum is σ = 59809075200. Its totient is φ = 5591721600.

The previous prime is 21697710017. The next prime is 21697710049. The reversal of 21697710030 is 3001779612.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8544501 + ... + 8547039.

It is an arithmetic number, because the mean of its divisors is an integer number (467258400).

Almost surely, 2^21697710030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21697710030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29904537600).

21697710030 is an abundant number, since it is smaller than the sum of its proper divisors (38111365170).

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

21697710030 is a wasteful number, since it uses less digits than its factorization.

21697710030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3607 (or 3601 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

The spelling of 21697710030 in words is "twenty-one billion, six hundred ninety-seven million, seven hundred ten thousand, thirty".