21253365566102 has 4 divisors (see below), whose sum is σ = 31880048349156. Its totient is φ = 10626682783050.

The previous prime is 21253365566063. The next prime is 21253365566117. The reversal of 21253365566102 is 20166556335212.

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

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, 5313341391524 + ... + 5313341391527.

It is an arithmetic number, because the mean of its divisors is an integer number (7970012087289).

Almost surely, 2^{21253365566102} is an apocalyptic number.

21253365566102 is a deficient number, since it is larger than the sum of its proper divisors (10626682783054).

21253365566102 is a wasteful number, since it uses less digits than its factorization.

21253365566102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10626682783053.

The product of its (nonzero) digits is 1944000, while the sum is 47.

The spelling of 21253365566102 in words is "twenty-one trillion, two hundred fifty-three billion, three hundred sixty-five million, five hundred sixty-six thousand, one hundred two".