21793179210 has 64 divisors (see below), whose sum is σ = 57147254784. Its totient is φ = 5274977600.

The previous prime is 21793179179. The next prime is 21793179217. The reversal of 21793179210 is 1297139712.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21793179217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 162475 + ... + 264545.

It is an arithmetic number, because the mean of its divisors is an integer number (892925856).

Almost surely, 2^21793179210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21793179210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28573627392).

21793179210 is an abundant number, since it is smaller than the sum of its proper divisors (35354075574).

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

21793179210 is a wasteful number, since it uses less digits than its factorization.

21793179210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102739.

The product of its (nonzero) digits is 47628, while the sum is 42.

The spelling of 21793179210 in words is "twenty-one billion, seven hundred ninety-three million, one hundred seventy-nine thousand, two hundred ten".