21983545279280 has 160 divisors (see below), whose sum is σ = 55295887920000. Its totient is φ = 8079786049536.

The previous prime is 21983545279261. The next prime is 21983545279331. The reversal of 21983545279280 is 8297254538912.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1659254096 + ... + 1659267344.

It is an arithmetic number, because the mean of its divisors is an integer number (345599299500).

Almost surely, 2^{21983545279280} is an apocalyptic number.

21983545279280 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 21983545279280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27647943960000).

21983545279280 is an abundant number, since it is smaller than the sum of its proper divisors (33312342640720).

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

21983545279280 is a wasteful number, since it uses less digits than its factorization.

21983545279280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20471 (or 20465 counting only the distinct ones).

The product of its (nonzero) digits is 87091200, while the sum is 65.

The spelling of 21983545279280 in words is "twenty-one trillion, nine hundred eighty-three billion, five hundred forty-five million, two hundred seventy-nine thousand, two hundred eighty".