2021021200091 has 8 divisors (see below), whose sum is σ = 2086234752000. Its totient is φ = 1955808855720.

The previous prime is 2021021200073. The next prime is 2021021200109. The reversal of 2021021200091 is 1900021201202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2021021200073) and next prime (2021021200109).

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 2021021200091 - 2⁶ = 2021021200027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021021200031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4134560 + ... + 4597458.

It is an arithmetic number, because the mean of its divisors is an integer number (260779344000).

Almost surely, 2^{2021021200091} is an apocalyptic number.

2021021200091 is a deficient number, since it is larger than the sum of its proper divisors (65213551909).

2021021200091 is a wasteful number, since it uses less digits than its factorization.

2021021200091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603769.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 2021021200091 its reverse (1900021201202), we get a palindrome (3921042401293).

The spelling of 2021021200091 in words is "two trillion, twenty-one billion, twenty-one million, two hundred thousand, ninety-one".