212454123521 has 4 divisors (see below), whose sum is σ = 213300554544. Its totient is φ = 211607692500.

The previous prime is 212454123517. The next prime is 212454123577. The reversal of 212454123521 is 125321454212.

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 212454123521 - 2² = 212454123517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212454123421) 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, 423215135 + ... + 423215636.

It is an arithmetic number, because the mean of its divisors is an integer number (53325138636).

Almost surely, 2^212454123521 is an apocalyptic number.

It is an amenable number.

212454123521 is a deficient number, since it is larger than the sum of its proper divisors (846431023).

212454123521 is an equidigital number, since it uses as much as digits as its factorization.

212454123521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846431022.

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

Adding to 212454123521 its reverse (125321454212), we get a palindrome (337775577733).

The spelling of 212454123521 in words is "two hundred twelve billion, four hundred fifty-four million, one hundred twenty-three thousand, five hundred twenty-one".