212321145 has 16 divisors (see below), whose sum is σ = 341595072. Its totient is φ = 112610880.

The previous prime is 212321129. The next prime is 212321167. The reversal of 212321145 is 541123212.

It is not a de Polignac number, because 212321145 - 2⁴ = 212321129 is a prime.

It is a super-2 number, since 2×212321145² = 90160537228222050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36387 + ... + 41816.

It is an arithmetic number, because the mean of its divisors is an integer number (21349692).

Almost surely, 2^212321145 is an apocalyptic number.

It is an amenable number.

212321145 is a deficient number, since it is larger than the sum of its proper divisors (129273927).

212321145 is a wasteful number, since it uses less digits than its factorization.

212321145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78392.

The product of its digits is 480, while the sum is 21.

The square root of 212321145 is about 14571.2437698365. The cubic root of 212321145 is about 596.5741290208.

Adding to 212321145 its reverse (541123212), we get a palindrome (753444357).

The spelling of 212321145 in words is "two hundred twelve million, three hundred twenty-one thousand, one hundred forty-five".