21517220634202 has 4 divisors (see below), whose sum is σ = 32275830951306. Its totient is φ = 10758610317100.

The previous prime is 21517220634179. The next prime is 21517220634257. The reversal of 21517220634202 is 20243602271512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19675177220241 + 1842043413961 = 4435671^2 + 1357219^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5379305158549 + ... + 5379305158552.

Almost surely, 2^{21517220634202} is an apocalyptic number.

21517220634202 is a deficient number, since it is larger than the sum of its proper divisors (10758610317104).

21517220634202 is a wasteful number, since it uses less digits than its factorization.

21517220634202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10758610317103.

The product of its (nonzero) digits is 80640, while the sum is 37.

The spelling of 21517220634202 in words is "twenty-one trillion, five hundred seventeen billion, two hundred twenty million, six hundred thirty-four thousand, two hundred two".