21698152840 has 128 divisors (see below), whose sum is σ = 61553157120. Its totient is φ = 6699571200.

The previous prime is 21698152829. The next prime is 21698152913. The reversal of 21698152840 is 4825189612.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

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, 76545 + ... + 221935.

It is an arithmetic number, because the mean of its divisors is an integer number (480884040).

Almost surely, 2^21698152840 is an apocalyptic number.

21698152840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21698152840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30776578560).

21698152840 is an abundant number, since it is smaller than the sum of its proper divisors (39855004280).

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

21698152840 is a wasteful number, since it uses less digits than its factorization.

21698152840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145463 (or 145459 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 21698152840 in words is "twenty-one billion, six hundred ninety-eight million, one hundred fifty-two thousand, eight hundred forty".