21150066311636 has 12 divisors (see below), whose sum is σ = 38012957019828. Its totient is φ = 10289221448832.

The previous prime is 21150066311629. The next prime is 21150066311641. The reversal of 21150066311636 is 63611366005112.

It can be written as a sum of positive squares in 2 ways, for example, as 7511743451536 + 13638322860100 = 2740756^2 + 3693010^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21150066311593 and 21150066311602.

It is a congruent number.

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, 71452926581 + ... + 71452926876.

It is an arithmetic number, because the mean of its divisors is an integer number (3167746418319).

Almost surely, 2^{21150066311636} is an apocalyptic number.

It is an amenable number.

21150066311636 is a deficient number, since it is larger than the sum of its proper divisors (16862890708192).

21150066311636 is a wasteful number, since it uses less digits than its factorization.

21150066311636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142905853498 (or 142905853496 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 41.

The spelling of 21150066311636 in words is "twenty-one trillion, one hundred fifty billion, sixty-six million, three hundred eleven thousand, six hundred thirty-six".