21719250980 has 144 divisors (see below), whose sum is σ = 56653914240. Its totient is φ = 6956877312.

The previous prime is 21719250967. The next prime is 21719250991. The reversal of 21719250980 is 8905291712.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 958016 + ... + 980424.

It is an arithmetic number, because the mean of its divisors is an integer number (393429960).

Almost surely, 2^21719250980 is an apocalyptic number.

21719250980 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 21719250980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28326957120).

21719250980 is an abundant number, since it is smaller than the sum of its proper divisors (34934663260).

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

21719250980 is a wasteful number, since it uses less digits than its factorization.

21719250980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22498 (or 22489 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 44.

The spelling of 21719250980 in words is "twenty-one billion, seven hundred nineteen million, two hundred fifty thousand, nine hundred eighty".