21115502351166 has 32 divisors (see below), whose sum is σ = 44817038449920. Its totient is φ = 6609381399936.

The previous prime is 21115502351107. The next prime is 21115502351197. The reversal of 21115502351166 is 66115320551112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235735096 + ... + 235824651.

It is an arithmetic number, because the mean of its divisors is an integer number (1400532451560).

Almost surely, 2^{21115502351166} is an apocalyptic number.

21115502351166 is an abundant number, since it is smaller than the sum of its proper divisors (23701536098754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21115502351166 is a wasteful number, since it uses less digits than its factorization.

21115502351166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471560208.

The product of its (nonzero) digits is 54000, while the sum is 39.

The spelling of 21115502351166 in words is "twenty-one trillion, one hundred fifteen billion, five hundred two million, three hundred fifty-one thousand, one hundred sixty-six".