212133081 has 16 divisors (see below), whose sum is σ = 298045440. Its totient is φ = 133837200.

The previous prime is 212133073. The next prime is 212133101. The reversal of 212133081 is 180331212.

212133081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212133081 - 2³ = 212133073 is a prime.

It is a super-2 number, since 2×212133081² = 90000888109105122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212133001) 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, 89056 + ... + 91406.

It is an arithmetic number, because the mean of its divisors is an integer number (18627840).

Almost surely, 2^212133081 is an apocalyptic number.

It is an amenable number.

212133081 is a deficient number, since it is larger than the sum of its proper divisors (85912359).

212133081 is a wasteful number, since it uses less digits than its factorization.

212133081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3956.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 212133081 is about 14564.7890818920. The cubic root of 212133081 is about 596.3979379672.

Adding to 212133081 its reverse (180331212), we get a palindrome (392464293).

The spelling of 212133081 in words is "two hundred twelve million, one hundred thirty-three thousand, eighty-one".