21272396090890 has 16 divisors (see below), whose sum is σ = 43760357672832. Its totient is φ = 7293392945424.

The previous prime is 21272396090873. The next prime is 21272396090917. The reversal of 21272396090890 is 9809069327212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151945686294 + ... + 151945686433.

It is an arithmetic number, because the mean of its divisors is an integer number (2735022354552).

Almost surely, 2^{21272396090890} is an apocalyptic number.

21272396090890 is an abundant number, since it is smaller than the sum of its proper divisors (22487961581942).

21272396090890 is a wasteful number, since it uses less digits than its factorization.

21272396090890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303891372741.

The product of its (nonzero) digits is 5878656, while the sum is 58.

The spelling of 21272396090890 in words is "twenty-one trillion, two hundred seventy-two billion, three hundred ninety-six million, ninety thousand, eight hundred ninety".