21115502545612 has 12 divisors (see below), whose sum is σ = 39125784128760. Its totient is φ = 9936707080256.

The previous prime is 21115502545609. The next prime is 21115502545649. The reversal of 21115502545612 is 21654520551112.

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, 155261048062 + ... + 155261048197.

It is an arithmetic number, because the mean of its divisors is an integer number (3260482010730).

Almost surely, 2^{21115502545612} is an apocalyptic number.

It is an amenable number.

21115502545612 is a deficient number, since it is larger than the sum of its proper divisors (18010281583148).

21115502545612 is a wasteful number, since it uses less digits than its factorization.

21115502545612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310522096280 (or 310522096278 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 40.

The spelling of 21115502545612 in words is "twenty-one trillion, one hundred fifteen billion, five hundred two million, five hundred forty-five thousand, six hundred twelve".