212454223511 has 4 divisors (see below), whose sum is σ = 212490727224. Its totient is φ = 212417719800.

The previous prime is 212454223483. The next prime is 212454223549. The reversal of 212454223511 is 115322454212.

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 212454223511 - 2³⁰ = 211380481687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212454223711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18243125 + ... + 18254766.

It is an arithmetic number, because the mean of its divisors is an integer number (53122681806).

Almost surely, 2^212454223511 is an apocalyptic number.

212454223511 is a deficient number, since it is larger than the sum of its proper divisors (36503713).

212454223511 is an equidigital number, since it uses as much as digits as its factorization.

212454223511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36503712.

The product of its digits is 19200, while the sum is 32.

Adding to 212454223511 its reverse (115322454212), we get a palindrome (327776677723).

The spelling of 212454223511 in words is "two hundred twelve billion, four hundred fifty-four million, two hundred twenty-three thousand, five hundred eleven".