1021200120019 has 2 divisors, whose sum is σ = 1021200120020. Its totient is φ = 1021200120018.

The previous prime is 1021200120001. The next prime is 1021200120071. The reversal of 1021200120019 is 9100210021201.

It is a happy number.

1021200120019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021200120019 - 2⁵ = 1021200119987 is a prime.

It is a super-2 number, since 2×1021200120019² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1021200119978 and 1021200120005.

It is not a weakly prime, because it can be changed into another prime (1021200120089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510600060009 + 510600060010.

It is an arithmetic number, because the mean of its divisors is an integer number (510600060010).

Almost surely, 2^{1021200120019} is an apocalyptic number.

1021200120019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021200120019 is an equidigital number, since it uses as much as digits as its factorization.

1021200120019 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 19.

The spelling of 1021200120019 in words is "one trillion, twenty-one billion, two hundred million, one hundred twenty thousand, nineteen".