212001221001 has 4 divisors (see below), whose sum is σ = 282668294672. Its totient is φ = 141334147332.

The previous prime is 212001220997. The next prime is 212001221009. The reversal of 212001221001 is 100122100212.

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 212001221001 - 2² = 212001220997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212001221009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35333536831 + ... + 35333536836.

It is an arithmetic number, because the mean of its divisors is an integer number (70667073668).

Almost surely, 2^212001221001 is an apocalyptic number.

It is an amenable number.

212001221001 is a deficient number, since it is larger than the sum of its proper divisors (70667073671).

212001221001 is an equidigital number, since it uses as much as digits as its factorization.

212001221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70667073670.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 212001221001 its reverse (100122100212), we get a palindrome (312123321213).

The spelling of 212001221001 in words is "two hundred twelve billion, one million, two hundred twenty-one thousand, one".