1200021983 has 2 divisors, whose sum is σ = 1200021984. Its totient is φ = 1200021982.

The previous prime is 1200021973. The next prime is 1200022037. The reversal of 1200021983 is 3891200021.

It is a weak prime.

It is an emirp because it is prime and its reverse (3891200021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1200021983 - 2⁴ = 1200021967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200021973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600010991 + 600010992.

It is an arithmetic number, because the mean of its divisors is an integer number (600010992).

Almost surely, 2^1200021983 is an apocalyptic number.

1200021983 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200021983 is an equidigital number, since it uses as much as digits as its factorization.

1200021983 is an evil number, because the sum of its binary digits is even.

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

The square root of 1200021983 is about 34641.3334471986. Note that the first 3 decimals coincide. The cubic root of 1200021983 is about 1062.6650581495.

The spelling of 1200021983 in words is "one billion, two hundred million, twenty-one thousand, nine hundred eighty-three".