21492391562880 has 512 divisors, whose sum is σ = 79191350784000. Its totient is φ = 4856340676608.

The previous prime is 21492391562819. The next prime is 21492391562881. The reversal of 21492391562880 is 8826519329412.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (21492391562881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1198072951 + ... + 1198090889.

It is an arithmetic number, because the mean of its divisors is an integer number (154670607000).

Almost surely, 2^{21492391562880} is an apocalyptic number.

21492391562880 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 21492391562880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39595675392000).

21492391562880 is an abundant number, since it is smaller than the sum of its proper divisors (57698959221120).

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

21492391562880 is a wasteful number, since it uses less digits than its factorization.

21492391562880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18984 (or 18972 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 60.

The spelling of 21492391562880 in words is "twenty-one trillion, four hundred ninety-two billion, three hundred ninety-one million, five hundred sixty-two thousand, eight hundred eighty".