1210021993 has 2 divisors, whose sum is σ = 1210021994. Its totient is φ = 1210021992.

The previous prime is 1210021963. The next prime is 1210021999. The reversal of 1210021993 is 3991200121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1206033984 + 3988009 = 34728^2 + 1997^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210021993 - 2⁵ = 1210021961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1210021999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605010996 + 605010997.

It is an arithmetic number, because the mean of its divisors is an integer number (605010997).

Almost surely, 2^1210021993 is an apocalyptic number.

It is an amenable number.

1210021993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210021993 is an equidigital number, since it uses as much as digits as its factorization.

1210021993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 1210021993 is about 34785.3703875638. The cubic root of 1210021993 is about 1065.6086928680.

The spelling of 1210021993 in words is "one billion, two hundred ten million, twenty-one thousand, nine hundred ninety-three".