21670745641420 has 12 divisors (see below), whose sum is σ = 45508565847024. Its totient is φ = 8668298256560.

The previous prime is 21670745641361. The next prime is 21670745641459. The reversal of 21670745641420 is 2414654707612.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 541768641016 + ... + 541768641055.

It is an arithmetic number, because the mean of its divisors is an integer number (3792380487252).

Almost surely, 2^{21670745641420} is an apocalyptic number.

21670745641420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21670745641420 is an abundant number, since it is smaller than the sum of its proper divisors (23837820205604).

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

21670745641420 is a wasteful number, since it uses less digits than its factorization.

21670745641420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083537282080 (or 1083537282078 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 49.

The spelling of 21670745641420 in words is "twenty-one trillion, six hundred seventy billion, seven hundred forty-five million, six hundred forty-one thousand, four hundred twenty".