212231505 has 16 divisors (see below), whose sum is σ = 345138624. Its totient is φ = 111334080.

The previous prime is 212231489. The next prime is 212231521. The reversal of 212231505 is 505132212.

It is an interprime number because it is at equal distance from previous prime (212231489) and next prime (212231521).

It is not a de Polignac number, because 212231505 - 2⁴ = 212231489 is a prime.

It is a nialpdrome in base 11 and base 16.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115059 + ... + 116888.

It is an arithmetic number, because the mean of its divisors is an integer number (21571164).

Almost surely, 2^212231505 is an apocalyptic number.

It is an amenable number.

212231505 is a deficient number, since it is larger than the sum of its proper divisors (132907119).

212231505 is a wasteful number, since it uses less digits than its factorization.

212231505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232016.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 212231505 is about 14568.1675237485. The cubic root of 212231505 is about 596.4901611986.

Adding to 212231505 its reverse (505132212), we get a palindrome (717363717).

The spelling of 212231505 in words is "two hundred twelve million, two hundred thirty-one thousand, five hundred five".