21696228054 has 128 divisors (see below), whose sum is σ = 51351874560. Its totient is φ = 6780153600.

The previous prime is 21696228023. The next prime is 21696228089. The reversal of 21696228054 is 45082269612.

21696228054 is a `hidden beast` number, since 2 + 16 + 9 + 622 + 8 + 0 + 5 + 4 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6797599 + ... + 6800789.

It is an arithmetic number, because the mean of its divisors is an integer number (401186520).

Almost surely, 2^21696228054 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21696228054, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25675937280).

21696228054 is an abundant number, since it is smaller than the sum of its proper divisors (29655646506).

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

21696228054 is a wasteful number, since it uses less digits than its factorization.

21696228054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3363 (or 3357 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 21696228054 in words is "twenty-one billion, six hundred ninety-six million, two hundred twenty-eight thousand, fifty-four".