212303310001221 has 4 divisors (see below), whose sum is σ = 283071080001632. Its totient is φ = 141535540000812.

The previous prime is 212303310001157. The next prime is 212303310001229. The reversal of 212303310001221 is 122100013303212.

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 not a de Polignac number, because 212303310001221 - 2⁶ = 212303310001157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212303310001229) 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, 35383885000201 + ... + 35383885000206.

It is an arithmetic number, because the mean of its divisors is an integer number (70767770000408).

Almost surely, 2^{212303310001221} is an apocalyptic number.

It is an amenable number.

212303310001221 is a deficient number, since it is larger than the sum of its proper divisors (70767770000411).

212303310001221 is an equidigital number, since it uses as much as digits as its factorization.

212303310001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70767770000410.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 212303310001221 its reverse (122100013303212), we get a palindrome (334403323304433).

The spelling of 212303310001221 in words is "two hundred twelve trillion, three hundred three billion, three hundred ten million, one thousand, two hundred twenty-one".