212405305451 has 4 divisors (see below), whose sum is σ = 212408697312. Its totient is φ = 212401913592.

The previous prime is 212405305423. The next prime is 212405305471. The reversal of 212405305451 is 154503504212.

212405305451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212405305451 - 2¹⁴ = 212405289067 is a prime.

It is a super-2 number, since 2×212405305451² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212405305471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1600196 + ... + 1727841.

It is an arithmetic number, because the mean of its divisors is an integer number (53102174328).

Almost surely, 2^212405305451 is an apocalyptic number.

212405305451 is a deficient number, since it is larger than the sum of its proper divisors (3391861).

212405305451 is an equidigital number, since it uses as much as digits as its factorization.

212405305451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3391860.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 212405305451 its reverse (154503504212), we get a palindrome (366908809663).

The spelling of 212405305451 in words is "two hundred twelve billion, four hundred five million, three hundred five thousand, four hundred fifty-one".