21670341220992 has 512 divisors, whose sum is σ = 62889471532800. Its totient is φ = 6584889507840.

The previous prime is 21670341220897. The next prime is 21670341220993. The reversal of 21670341220992 is 29902214307612.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (21670341220993) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20271600234 + ... + 20271601302.

Almost surely, 2^{21670341220992} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21670341220992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31444735766400).

21670341220992 is an abundant number, since it is smaller than the sum of its proper divisors (41219130311808).

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

21670341220992 is a wasteful number, since it uses less digits than its factorization.

21670341220992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1684 (or 1672 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 48.

The spelling of 21670341220992 in words is "twenty-one trillion, six hundred seventy billion, three hundred forty-one million, two hundred twenty thousand, nine hundred ninety-two".