21120001202091 has 16 divisors (see below), whose sum is σ = 30730642691328. Its totient is φ = 12795567002400.

The previous prime is 21120001202029. The next prime is 21120001202117. The reversal of 21120001202091 is 19020210002112.

It is not a de Polignac number, because 21120001202091 - 2³¹ = 21117853718443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120001200091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110746440 + ... + 110936981.

It is an arithmetic number, because the mean of its divisors is an integer number (1920665168208).

Almost surely, 2^{21120001202091} is an apocalyptic number.

21120001202091 is a deficient number, since it is larger than the sum of its proper divisors (9610641489237).

21120001202091 is a wasteful number, since it uses less digits than its factorization.

21120001202091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221686322.

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

The spelling of 21120001202091 in words is "twenty-one trillion, one hundred twenty billion, one million, two hundred two thousand, ninety-one".