121221223019 has 16 divisors (see below), whose sum is σ = 132262502400. Its totient is φ = 110426543136.

The previous prime is 121221222989. The next prime is 121221223061. The reversal of 121221223019 is 910322122121.

It is not a de Polignac number, because 121221223019 - 2²⁰ = 121220174443 is a prime.

It is a super-2 number, since 2×121221223019² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221223099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2173322 + ... + 2228400.

It is an arithmetic number, because the mean of its divisors is an integer number (8266406400).

Almost surely, 2^121221223019 is an apocalyptic number.

121221223019 is a deficient number, since it is larger than the sum of its proper divisors (11041279381).

121221223019 is a wasteful number, since it uses less digits than its factorization.

121221223019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57314.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 121221223019 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-three thousand, nineteen".