85221215 has 16 divisors (see below), whose sum is σ = 103498560. Its totient is φ = 67361280.

The previous prime is 85221203. The next prime is 85221217. The reversal of 85221215 is 51212258.

It is not a de Polignac number, because 85221215 - 2¹⁸ = 84959071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85221217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237206 + ... + 237564.

It is an arithmetic number, because the mean of its divisors is an integer number (6468660).

Almost surely, 2^85221215 is an apocalyptic number.

85221215 is a deficient number, since it is larger than the sum of its proper divisors (18277345).

85221215 is a wasteful number, since it uses less digits than its factorization.

85221215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802.

The product of its digits is 1600, while the sum is 26.

The square root of 85221215 is about 9231.5337295598. The cubic root of 85221215 is about 440.0640660844.

The spelling of 85221215 in words is "eighty-five million, two hundred twenty-one thousand, two hundred fifteen".