20210022020091 has 4 divisors (see below), whose sum is σ = 26946696026792. Its totient is φ = 13473348013392.

The previous prime is 20210022020059. The next prime is 20210022020099. The reversal of 20210022020091 is 19002022001202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20210022020091 - 2⁵ = 20210022020059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20210022020099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3368337003346 + ... + 3368337003351.

It is an arithmetic number, because the mean of its divisors is an integer number (6736674006698).

Almost surely, 2^{20210022020091} is an apocalyptic number.

20210022020091 is a deficient number, since it is larger than the sum of its proper divisors (6736674006701).

20210022020091 is an equidigital number, since it uses as much as digits as its factorization.

20210022020091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6736674006700.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 20210022020091 its reverse (19002022001202), we get a palindrome (39212044021293).

The spelling of 20210022020091 in words is "twenty trillion, two hundred ten billion, twenty-two million, twenty thousand, ninety-one".