1210220021999 has 2 divisors, whose sum is σ = 1210220022000. Its totient is φ = 1210220021998.

The previous prime is 1210220021981. The next prime is 1210220022007. The reversal of 1210220021999 is 9991200220121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1210220021999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210220021299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605110010999 + 605110011000.

It is an arithmetic number, because the mean of its divisors is an integer number (605110011000).

Almost surely, 2^{1210220021999} is an apocalyptic number.

1210220021999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210220021999 is an equidigital number, since it uses as much as digits as its factorization.

1210220021999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 1210220021999 in words is "one trillion, two hundred ten billion, two hundred twenty million, twenty-one thousand, nine hundred ninety-nine".