85290029921 has 2 divisors, whose sum is σ = 85290029922. Its totient is φ = 85290029920.

The previous prime is 85290029863. The next prime is 85290029941. The reversal of 85290029921 is 12992009258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65658937600 + 19631092321 = 256240^2 + 140111^2 .

It is a cyclic number.

It is not a de Polignac number, because 85290029921 - 2²² = 85285835617 is a prime.

It is not a weakly prime, because it can be changed into another prime (85290029941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42645014960 + 42645014961.

It is an arithmetic number, because the mean of its divisors is an integer number (42645014961).

Almost surely, 2^85290029921 is an apocalyptic number.

It is an amenable number.

85290029921 is a deficient number, since it is larger than the sum of its proper divisors (1).

85290029921 is an equidigital number, since it uses as much as digits as its factorization.

85290029921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 47.

The spelling of 85290029921 in words is "eighty-five billion, two hundred ninety million, twenty-nine thousand, nine hundred twenty-one".