21115655213314 has 4 divisors (see below), whose sum is σ = 31673482819974. Its totient is φ = 10557827606656.

The previous prime is 21115655213311. The next prime is 21115655213329. The reversal of 21115655213314 is 41331255651112.

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., 17701937072689 + 3413718140625 = 4207367^2 + 1847625^2 .

It is not an unprimeable number, because it can be changed into a prime (21115655213311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5278913803327 + ... + 5278913803330.

Almost surely, 2^{21115655213314} is an apocalyptic number.

21115655213314 is a deficient number, since it is larger than the sum of its proper divisors (10557827606660).

21115655213314 is a wasteful number, since it uses less digits than its factorization.

21115655213314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10557827606659.

The product of its digits is 108000, while the sum is 40.

The spelling of 21115655213314 in words is "twenty-one trillion, one hundred fifteen billion, six hundred fifty-five million, two hundred thirteen thousand, three hundred fourteen".