17921210102212 has 12 divisors (see below), whose sum is σ = 31362208913980. Its totient is φ = 8960578983936.

The previous prime is 17921210102171. The next prime is 17921210102239. The reversal of 17921210102212 is 21220101212971.

It can be written as a sum of positive squares in 2 ways, for example, as 2367209953476 + 15554000148736 = 1538574^2 + 3943856^2 .

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, 4926813 + ... + 7753444.

Almost surely, 2^{17921210102212} is an apocalyptic number.

It is an amenable number.

17921210102212 is a deficient number, since it is larger than the sum of its proper divisors (13440998811768).

17921210102212 is a wasteful number, since it uses less digits than its factorization.

17921210102212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13033590 (or 13033588 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 31.

The spelling of 17921210102212 in words is "seventeen trillion, nine hundred twenty-one billion, two hundred ten million, one hundred two thousand, two hundred twelve".