213122445 has 16 divisors (see below), whose sum is σ = 343452480. Its totient is φ = 112846464.

The previous prime is 213122443. The next prime is 213122461. The reversal of 213122445 is 544221312.

It is not a de Polignac number, because 213122445 - 2¹ = 213122443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213122443) 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, 49024 + ... + 53193.

It is an arithmetic number, because the mean of its divisors is an integer number (21465780).

Almost surely, 2^213122445 is an apocalyptic number.

It is an amenable number.

213122445 is a deficient number, since it is larger than the sum of its proper divisors (130330035).

213122445 is a wasteful number, since it uses less digits than its factorization.

213122445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102364.

The product of its digits is 1920, while the sum is 24.

The square root of 213122445 is about 14598.7138132097. The cubic root of 213122445 is about 597.3236771318.

Adding to 213122445 its reverse (544221312), we get a palindrome (757343757).

The spelling of 213122445 in words is "two hundred thirteen million, one hundred twenty-two thousand, four hundred forty-five".