21120012020091 has 8 divisors (see below), whose sum is σ = 28256125297680. Its totient is φ = 14031953377952.

The previous prime is 21120012020087. The next prime is 21120012020099. The reversal of 21120012020091 is 19002021002112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21120012020091 - 2² = 21120012020087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120012020099) by changing a digit.

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, 12013657836 + ... + 12013659593.

It is an arithmetic number, because the mean of its divisors is an integer number (3532015662210).

Almost surely, 2^{21120012020091} is an apocalyptic number.

21120012020091 is a deficient number, since it is larger than the sum of its proper divisors (7136113277589).

21120012020091 is a wasteful number, since it uses less digits than its factorization.

21120012020091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24027317725.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 21120012020091 in words is "twenty-one trillion, one hundred twenty billion, twelve million, twenty thousand, ninety-one".