212122652431 has 4 divisors (see below), whose sum is σ = 212142556432. Its totient is φ = 212102748432.

The previous prime is 212122652359. The next prime is 212122652447. The reversal of 212122652431 is 134256221212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212122652431 - 2⁷ = 212122652303 is a prime.

It is a super-2 number, since 2×212122652431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212122652393 and 212122652402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212122652461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9936006 + ... + 9957331.

It is an arithmetic number, because the mean of its divisors is an integer number (53035639108).

Almost surely, 2^212122652431 is an apocalyptic number.

212122652431 is a deficient number, since it is larger than the sum of its proper divisors (19904001).

212122652431 is a wasteful number, since it uses less digits than its factorization.

212122652431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19904000.

The product of its digits is 11520, while the sum is 31.

Adding to 212122652431 its reverse (134256221212), we get a palindrome (346378873643).

The spelling of 212122652431 in words is "two hundred twelve billion, one hundred twenty-two million, six hundred fifty-two thousand, four hundred thirty-one".