212144200421 has 4 divisors (see below), whose sum is σ = 224623271052. Its totient is φ = 199665129792.

The previous prime is 212144200417. The next prime is 212144200487. The reversal of 212144200421 is 124002441212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 150048544321 + 62095656100 = 387361^2 + 249190^2 .

It is a cyclic number.

It is not a de Polignac number, because 212144200421 - 2² = 212144200417 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 (212144202421) 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, 6239535290 + ... + 6239535323.

It is an arithmetic number, because the mean of its divisors is an integer number (56155817763).

Almost surely, 2^212144200421 is an apocalyptic number.

It is an amenable number.

212144200421 is a deficient number, since it is larger than the sum of its proper divisors (12479070631).

212144200421 is a wasteful number, since it uses less digits than its factorization.

212144200421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12479070630.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 212144200421 its reverse (124002441212), we get a palindrome (336146641633).

The spelling of 212144200421 in words is "two hundred twelve billion, one hundred forty-four million, two hundred thousand, four hundred twenty-one".