211020001221001 has 4 divisors (see below), whose sum is σ = 241165715681152. Its totient is φ = 180874286760852.

The previous prime is 211020001220857. The next prime is 211020001221013. The reversal of 211020001221001 is 100122100020112.

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 211020001221001 - 2⁹ = 211020001220489 is a prime.

It is a super-2 number, since 2×211020001221001² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211020001221091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15072857230065 + ... + 15072857230078.

It is an arithmetic number, because the mean of its divisors is an integer number (60291428920288).

Almost surely, 2^{211020001221001} is an apocalyptic number.

It is an amenable number.

211020001221001 is a deficient number, since it is larger than the sum of its proper divisors (30145714460151).

211020001221001 is an equidigital number, since it uses as much as digits as its factorization.

211020001221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30145714460150.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211020001221001 its reverse (100122100020112), we get a palindrome (311142101241113).

The spelling of 211020001221001 in words is "two hundred eleven trillion, twenty billion, one million, two hundred twenty-one thousand, one".