21835366670172 has 48 divisors (see below), whose sum is σ = 55586978496000. Its totient is φ = 6616058117760.

The previous prime is 21835366670111. The next prime is 21835366670177. The reversal of 21835366670172 is 27107666353812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21835366670177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7776897 + ... + 10205432.

It is an arithmetic number, because the mean of its divisors is an integer number (1158062052000).

Almost surely, 2^{21835366670172} is an apocalyptic number.

21835366670172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21835366670172 is an abundant number, since it is smaller than the sum of its proper divisors (33751611825828).

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

21835366670172 is a wasteful number, since it uses less digits than its factorization.

21835366670172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17991546 (or 17991544 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 57.

The spelling of 21835366670172 in words is "twenty-one trillion, eight hundred thirty-five billion, three hundred sixty-six million, six hundred seventy thousand, one hundred seventy-two".