21161002315604 has 6 divisors (see below), whose sum is σ = 37031754052314. Its totient is φ = 10580501157800.

The previous prime is 21161002315571. The next prime is 21161002315637. The reversal of 21161002315604 is 40651320016112.

It is an interprime number because it is at equal distance from previous prime (21161002315571) and next prime (21161002315637).

It can be written as a sum of positive squares in only one way, i.e., 20180328031504 + 980674284100 = 4492252^2 + 990290^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2645125289447 + ... + 2645125289454.

It is an arithmetic number, because the mean of its divisors is an integer number (6171959008719).

Almost surely, 2^{21161002315604} is an apocalyptic number.

It is an amenable number.

21161002315604 is a deficient number, since it is larger than the sum of its proper divisors (15870751736710).

21161002315604 is a wasteful number, since it uses less digits than its factorization.

21161002315604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5290250578905 (or 5290250578903 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 21161002315604 in words is "twenty-one trillion, one hundred sixty-one billion, two million, three hundred fifteen thousand, six hundred four".