21172000610208 has 96 divisors (see below), whose sum is σ = 63657463766400. Its totient is φ = 6035670466560.

The previous prime is 21172000610197. The next prime is 21172000610209. The reversal of 21172000610208 is 80201600027112.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (21172000610209) 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, 34782853 + ... + 35386308.

It is an arithmetic number, because the mean of its divisors is an integer number (663098580900).

Almost surely, 2^{21172000610208} is an apocalyptic number.

21172000610208 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21172000610208 is an abundant number, since it is smaller than the sum of its proper divisors (42485463156192).

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

21172000610208 is a wasteful number, since it uses less digits than its factorization.

21172000610208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70169630 (or 70169622 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The spelling of 21172000610208 in words is "twenty-one trillion, one hundred seventy-two billion, six hundred ten thousand, two hundred eight".