21897472393104 has 1440 divisors, whose sum is σ = 76701002571648. Its totient is φ = 5357153894400.

The previous prime is 21897472393073. The next prime is 21897472393123. The reversal of 21897472393104 is 40139327479812.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 46889662279 + ... + 46889662745.

Almost surely, 2^{21897472393104} is an apocalyptic number.

21897472393104 is a gapful number since it is divisible by the number (24) 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 21897472393104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38350501285824).

21897472393104 is an abundant number, since it is smaller than the sum of its proper divisors (54803530178544).

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

21897472393104 is a wasteful number, since it uses less digits than its factorization.

21897472393104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685 (or 661 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 60.

The spelling of 21897472393104 in words is "twenty-one trillion, eight hundred ninety-seven billion, four hundred seventy-two million, three hundred ninety-three thousand, one hundred four".