212630261 has 4 divisors (see below), whose sum is σ = 212755392. Its totient is φ = 212505132.

The previous prime is 212630251. The next prime is 212630263. The reversal of 212630261 is 162036212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212630261 - 2¹⁰ = 212629237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212630263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59981 + ... + 63426.

It is an arithmetic number, because the mean of its divisors is an integer number (53188848).

Almost surely, 2^212630261 is an apocalyptic number.

It is an amenable number.

212630261 is a deficient number, since it is larger than the sum of its proper divisors (125131).

212630261 is a wasteful number, since it uses less digits than its factorization.

212630261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125130.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 212630261 is about 14581.8469680627. The cubic root of 212630261 is about 596.8635038528.

Adding to 212630261 its reverse (162036212), we get a palindrome (374666473).

The spelling of 212630261 in words is "two hundred twelve million, six hundred thirty thousand, two hundred sixty-one".