211220001001 has 4 divisors (see below), whose sum is σ = 212515829392. Its totient is φ = 209924172612.

The previous prime is 211220000947. The next prime is 211220001011. The reversal of 211220001001 is 100100022112.

211220001001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 211220001001 - 2¹⁷ = 211219869929 is a prime.

It is a super-2 number, since 2×211220001001² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211220001011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 647913951 + ... + 647914276.

It is an arithmetic number, because the mean of its divisors is an integer number (53128957348).

Almost surely, 2^211220001001 is an apocalyptic number.

It is an amenable number.

211220001001 is a deficient number, since it is larger than the sum of its proper divisors (1295828391).

211220001001 is a wasteful number, since it uses less digits than its factorization.

211220001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295828390.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 211220001001 its reverse (100100022112), we get a palindrome (311320023113).

The spelling of 211220001001 in words is "two hundred eleven billion, two hundred twenty million, one thousand, one".