212201051521 has 4 divisors (see below), whose sum is σ = 212202128944. Its totient is φ = 212199974100.

The previous prime is 212201051509. The next prime is 212201051539. The reversal of 212201051521 is 125150102212.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 212201051521 - 2⁷ = 212201051393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212201051492 and 212201051501.

It is not an unprimeable number, because it can be changed into a prime (212201051021) 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, 149595 + ... + 668416.

It is an arithmetic number, because the mean of its divisors is an integer number (53050532236).

Almost surely, 2^212201051521 is an apocalyptic number.

It is an amenable number.

212201051521 is a deficient number, since it is larger than the sum of its proper divisors (1077423).

212201051521 is an equidigital number, since it uses as much as digits as its factorization.

212201051521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077422.

The product of its (nonzero) digits is 400, while the sum is 22.

Adding to 212201051521 its reverse (125150102212), we get a palindrome (337351153733).

The spelling of 212201051521 in words is "two hundred twelve billion, two hundred one million, fifty-one thousand, five hundred twenty-one".