85422121 has 2 divisors, whose sum is σ = 85422122. Its totient is φ = 85422120.

The previous prime is 85422109. The next prime is 85422131. The reversal of 85422121 is 12122458.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85377600 + 44521 = 9240^2 + 211^2 .

It is a cyclic number.

It is not a de Polignac number, because 85422121 - 2⁵ = 85422089 is a prime.

It is a super-2 number, since 2×85422121² = 14593877512277282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85422131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42711060 + 42711061.

It is an arithmetic number, because the mean of its divisors is an integer number (42711061).

Almost surely, 2^85422121 is an apocalyptic number.

It is an amenable number.

85422121 is a deficient number, since it is larger than the sum of its proper divisors (1).

85422121 is an equidigital number, since it uses as much as digits as its factorization.

85422121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1280, while the sum is 25.

The square root of 85422121 is about 9242.4088310353. The cubic root of 85422121 is about 440.4096065168.

Adding to 85422121 its reverse (12122458), we get a palindrome (97544579).

The spelling of 85422121 in words is "eighty-five million, four hundred twenty-two thousand, one hundred twenty-one".