21826767680 has 112 divisors (see below), whose sum is σ = 55102573056. Its totient is φ = 8220579840.

The previous prime is 21826767679. The next prime is 21826767691. The reversal of 21826767680 is 8676762812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 337307 + ... + 396773.

Almost surely, 2^21826767680 is an apocalyptic number.

21826767680 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 21826767680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27551286528).

21826767680 is an abundant number, since it is smaller than the sum of its proper divisors (33275805376).

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

21826767680 is a wasteful number, since it uses less digits than its factorization.

21826767680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59552 (or 59542 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 53.

The spelling of 21826767680 in words is "twenty-one billion, eight hundred twenty-six million, seven hundred sixty-seven thousand, six hundred eighty".