20000121222091 has 4 divisors (see below), whose sum is σ = 20869691710032. Its totient is φ = 19130550734152.

The previous prime is 20000121222047. The next prime is 20000121222113. The reversal of 20000121222091 is 19022212100002.

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

It is a cyclic number.

It is not a de Polignac number, because 20000121222091 - 2¹¹ = 20000121220043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20000121228091) 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, 434785243936 + ... + 434785243981.

It is an arithmetic number, because the mean of its divisors is an integer number (5217422927508).

Almost surely, 2^{20000121222091} is an apocalyptic number.

20000121222091 is a deficient number, since it is larger than the sum of its proper divisors (869570487941).

20000121222091 is an equidigital number, since it uses as much as digits as its factorization.

20000121222091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869570487940.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 20000121222091 its reverse (19022212100002), we get a palindrome (39022333322093).

The spelling of 20000121222091 in words is "twenty trillion, one hundred twenty-one million, two hundred twenty-two thousand, ninety-one".