84263752921 has 2 divisors, whose sum is σ = 84263752922. Its totient is φ = 84263752920.

The previous prime is 84263752829. The next prime is 84263752927. The reversal of 84263752921 is 12925736248.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50897616025 + 33366136896 = 225605^2 + 182664^2 .

It is a cyclic number.

It is not a de Polignac number, because 84263752921 - 2¹⁵ = 84263720153 is a prime.

It is not a weakly prime, because it can be changed into another prime (84263752927) 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, 42131876460 + 42131876461.

It is an arithmetic number, because the mean of its divisors is an integer number (42131876461).

Almost surely, 2^84263752921 is an apocalyptic number.

It is an amenable number.

84263752921 is a deficient number, since it is larger than the sum of its proper divisors (1).

84263752921 is an equidigital number, since it uses as much as digits as its factorization.

84263752921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 49.

The spelling of 84263752921 in words is "eighty-four billion, two hundred sixty-three million, seven hundred fifty-two thousand, nine hundred twenty-one".