212122045 has 16 divisors (see below), whose sum is σ = 261451008. Its totient is φ = 165136320.

The previous prime is 212122019. The next prime is 212122049. The reversal of 212122045 is 540221212.

It is a de Polignac number, because none of the positive numbers 2^k-212122045 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212122049) 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, 40042 + ... + 45028.

It is an arithmetic number, because the mean of its divisors is an integer number (16340688).

Almost surely, 2^212122045 is an apocalyptic number.

It is an amenable number.

212122045 is a deficient number, since it is larger than the sum of its proper divisors (49328963).

212122045 is a wasteful number, since it uses less digits than its factorization.

212122045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5220.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 212122045 is about 14564.4102180624. The cubic root of 212122045 is about 596.3875954631.

Adding to 212122045 its reverse (540221212), we get a palindrome (752343257).

The spelling of 212122045 in words is "two hundred twelve million, one hundred twenty-two thousand, forty-five".