89212121 has 4 divisors (see below), whose sum is σ = 89727972. Its totient is φ = 88696272.

The previous prime is 89212117. The next prime is 89212129. The reversal of 89212121 is 12121298.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 80802121 + 8410000 = 8989^2 + 2900^2 .

It is a cyclic number.

It is not a de Polignac number, because 89212121 - 2² = 89212117 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89212129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257666 + ... + 258011.

It is an arithmetic number, because the mean of its divisors is an integer number (22431993).

Almost surely, 2^89212121 is an apocalyptic number.

It is an amenable number.

89212121 is a deficient number, since it is larger than the sum of its proper divisors (515851).

89212121 is a wasteful number, since it uses less digits than its factorization.

89212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515850.

The product of its digits is 576, while the sum is 26.

The square root of 89212121 is about 9445.2168318149. The cubic root of 89212121 is about 446.8289345705.

It can be divided in two parts, 8 and 9212121, that added together give a palindrome (9212129).

The spelling of 89212121 in words is "eighty-nine million, two hundred twelve thousand, one hundred twenty-one".