921978120229 has 2 divisors, whose sum is σ = 921978120230. Its totient is φ = 921978120228.

The previous prime is 921978120197. The next prime is 921978120299. The reversal of 921978120229 is 922021879129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 905561592100 + 16416528129 = 951610^2 + 128127^2 .

It is a cyclic number.

It is not a de Polignac number, because 921978120229 - 2⁵ = 921978120197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921978120299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460989060114 + 460989060115.

It is an arithmetic number, because the mean of its divisors is an integer number (460989060115).

Almost surely, 2^921978120229 is an apocalyptic number.

It is an amenable number.

921978120229 is a deficient number, since it is larger than the sum of its proper divisors (1).

921978120229 is an equidigital number, since it uses as much as digits as its factorization.

921978120229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 52.

The spelling of 921978120229 in words is "nine hundred twenty-one billion, nine hundred seventy-eight million, one hundred twenty thousand, two hundred twenty-nine".