21120001020091 has 32 divisors (see below), whose sum is σ = 22566608967168. Its totient is φ = 19723124678400.

The previous prime is 21120001020089. The next prime is 21120001020127. The reversal of 21120001020091 is 19002010002112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21120001020091 - 2¹ = 21120001020089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120001020991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 886377520 + ... + 886401346.

It is an arithmetic number, because the mean of its divisors is an integer number (705206530224).

Almost surely, 2^{21120001020091} is an apocalyptic number.

21120001020091 is a deficient number, since it is larger than the sum of its proper divisors (1446607947077).

21120001020091 is a wasteful number, since it uses less digits than its factorization.

21120001020091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29251.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 21120001020091 in words is "twenty-one trillion, one hundred twenty billion, one million, twenty thousand, ninety-one".