121021200019 has 2 divisors, whose sum is σ = 121021200020. Its totient is φ = 121021200018.

The previous prime is 121021200011. The next prime is 121021200037. The reversal of 121021200019 is 910002120121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121021200019 - 2³ = 121021200011 is a prime.

It is a super-2 number, since 2×121021200019² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121021199969 and 121021200005.

It is not a weakly prime, because it can be changed into another prime (121021200011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510600009 + 60510600010.

It is an arithmetic number, because the mean of its divisors is an integer number (60510600010).

Almost surely, 2^121021200019 is an apocalyptic number.

121021200019 is a deficient number, since it is larger than the sum of its proper divisors (1).

121021200019 is an equidigital number, since it uses as much as digits as its factorization.

121021200019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

It can be divided in two parts, 12102 and 1200019, that added together give a palindrome (1212121).

The spelling of 121021200019 in words is "one hundred twenty-one billion, twenty-one million, two hundred thousand, nineteen".