21788226456 has 32 divisors (see below), whose sum is σ = 54526037760. Its totient is φ = 7255345952.

The previous prime is 21788226431. The next prime is 21788226457. The reversal of 21788226456 is 65462288712.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21788226399 and 21788226408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21788226457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 438180 + ... + 485363.

It is an arithmetic number, because the mean of its divisors is an integer number (1703938680).

Almost surely, 2^21788226456 is an apocalyptic number.

It is an amenable number.

21788226456 is an abundant number, since it is smaller than the sum of its proper divisors (32737811304).

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

21788226456 is a wasteful number, since it uses less digits than its factorization.

21788226456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924535 (or 924531 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 51.

The spelling of 21788226456 in words is "twenty-one billion, seven hundred eighty-eight million, two hundred twenty-six thousand, four hundred fifty-six".