21161501012 has 48 divisors (see below), whose sum is σ = 38187096192. Its totient is φ = 10256188800.

The previous prime is 21161500981. The next prime is 21161501027. The reversal of 21161501012 is 21010516112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14623673 + ... + 14625119.

It is an arithmetic number, because the mean of its divisors is an integer number (795564504).

Almost surely, 2^21161501012 is an apocalyptic number.

It is an amenable number.

21161501012 is a deficient number, since it is larger than the sum of its proper divisors (17025595180).

21161501012 is a wasteful number, since it uses less digits than its factorization.

21161501012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2288 (or 2286 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 20.

The spelling of 21161501012 in words is "twenty-one billion, one hundred sixty-one million, five hundred one thousand, twelve".