921978120299 has 2 divisors, whose sum is σ = 921978120300. Its totient is φ = 921978120298.

The previous prime is 921978120229. The next prime is 921978120331. The reversal of 921978120299 is 992021879129.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 921978120299 - 2¹² = 921978116203 is a prime.

It is not a weakly prime, because it can be changed into another prime (921978120229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460989060149 + 460989060150.

It is an arithmetic number, because the mean of its divisors is an integer number (460989060150).

Almost surely, 2^921978120299 is an apocalyptic number.

921978120299 is a deficient number, since it is larger than the sum of its proper divisors (1).

921978120299 is an equidigital number, since it uses as much as digits as its factorization.

921978120299 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 59.

The spelling of 921978120299 in words is "nine hundred twenty-one billion, nine hundred seventy-eight million, one hundred twenty thousand, two hundred ninety-nine".