85030921 has 16 divisors (see below), whose sum is σ = 89926848. Its totient is φ = 80308800.

The previous prime is 85030919. The next prime is 85030961. The reversal of 85030921 is 12903058.

It is a cyclic number.

It is not a de Polignac number, because 85030921 - 2¹ = 85030919 is a prime.

It is a super-2 number, since 2×85030921² = 14460515052216482, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85030921.

It is not an unprimeable number, because it can be changed into a prime (85030901) 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, 256726 + ... + 257056.

It is an arithmetic number, because the mean of its divisors is an integer number (5620428).

It is a Poulet number, since it divides 2^85030920-1.

Almost surely, 2^85030921 is an apocalyptic number.

It is an amenable number.

85030921 is a deficient number, since it is larger than the sum of its proper divisors (4895927).

85030921 is a wasteful number, since it uses less digits than its factorization.

85030921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 85030921 is about 9221.2212314856. The cubic root of 85030921 is about 439.7362761915.

Adding to 85030921 its reverse (12903058), we get a palindrome (97933979).

The spelling of 85030921 in words is "eighty-five million, thirty thousand, nine hundred twenty-one".