21746855480 has 64 divisors (see below), whose sum is σ = 56443184640. Its totient is φ = 7386371712.

The previous prime is 21746855411. The next prime is 21746855483. The reversal of 21746855480 is 8455864712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21746855483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332972 + ... + 392891.

It is an arithmetic number, because the mean of its divisors is an integer number (881924760).

Almost surely, 2^21746855480 is an apocalyptic number.

21746855480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21746855480 is an abundant number, since it is smaller than the sum of its proper divisors (34696329160).

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

21746855480 is a wasteful number, since it uses less digits than its factorization.

21746855480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725988 (or 725984 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 50.

The spelling of 21746855480 in words is "twenty-one billion, seven hundred forty-six million, eight hundred fifty-five thousand, four hundred eighty".