20112121019 has 2 divisors, whose sum is σ = 20112121020. Its totient is φ = 20112121018.

The previous prime is 20112120983. The next prime is 20112121063. The reversal of 20112121019 is 91012121102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20112121019 - 2²⁴ = 20095343803 is a prime.

It is a super-2 number, since 2×20112121019² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20112121619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056060509 + 10056060510.

It is an arithmetic number, because the mean of its divisors is an integer number (10056060510).

Almost surely, 2^20112121019 is an apocalyptic number.

20112121019 is a deficient number, since it is larger than the sum of its proper divisors (1).

20112121019 is an equidigital number, since it uses as much as digits as its factorization.

20112121019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 20112121019 in words is "twenty billion, one hundred twelve million, one hundred twenty-one thousand, nineteen".