212345205454 has 4 divisors (see below), whose sum is σ = 318517808184. Its totient is φ = 106172602726.

The previous prime is 212345205407. The next prime is 212345205491. The reversal of 212345205454 is 454502543212.

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

It is a super-2 number, since 2×212345205454² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53086301362 + ... + 53086301365.

It is an arithmetic number, because the mean of its divisors is an integer number (79629452046).

Almost surely, 2^212345205454 is an apocalyptic number.

212345205454 is a deficient number, since it is larger than the sum of its proper divisors (106172602730).

212345205454 is a wasteful number, since it uses less digits than its factorization.

212345205454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106172602729.

The product of its (nonzero) digits is 192000, while the sum is 37.

Adding to 212345205454 its reverse (454502543212), we get a palindrome (666847748666).

The spelling of 212345205454 in words is "two hundred twelve billion, three hundred forty-five million, two hundred five thousand, four hundred fifty-four".