121221002019 has 8 divisors (see below), whose sum is σ = 174060926032. Its totient is φ = 74597539680.

The previous prime is 121221001939. The next prime is 121221002069. The reversal of 121221002019 is 910200122121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121221002019 - 2¹¹ = 121220999971 is a prime.

It is a super-2 number, since 2×121221002019² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121221001986 and 121221002004.

It is not an unprimeable number, because it can be changed into a prime (121221002069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1554115372 + ... + 1554115449.

It is an arithmetic number, because the mean of its divisors is an integer number (21757615754).

Almost surely, 2^121221002019 is an apocalyptic number.

121221002019 is a deficient number, since it is larger than the sum of its proper divisors (52839924013).

121221002019 is a wasteful number, since it uses less digits than its factorization.

121221002019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3108230837.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 121221002019 in words is "one hundred twenty-one billion, two hundred twenty-one million, two thousand, nineteen".