20112201011921 has 2 divisors, whose sum is σ = 20112201011922. Its totient is φ = 20112201011920.

The previous prime is 20112201011879. The next prime is 20112201012061. The reversal of 20112201011921 is 12911010221102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18924022530625 + 1188178481296 = 4350175^2 + 1090036^2 .

It is a cyclic number.

It is not a de Polignac number, because 20112201011921 - 2¹⁸ = 20112200749777 is a prime.

It is a super-2 number, since 2×20112201011921² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20112203011921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056100505960 + 10056100505961.

It is an arithmetic number, because the mean of its divisors is an integer number (10056100505961).

Almost surely, 2^{20112201011921} is an apocalyptic number.

It is an amenable number.

20112201011921 is a deficient number, since it is larger than the sum of its proper divisors (1).

20112201011921 is an equidigital number, since it uses as much as digits as its factorization.

20112201011921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 20112201011921 in words is "twenty trillion, one hundred twelve billion, two hundred one million, eleven thousand, nine hundred twenty-one".