211001122021 has 16 divisors (see below), whose sum is σ = 222280848000. Its totient is φ = 199897696768.

The previous prime is 211001121983. The next prime is 211001122027. The reversal of 211001122021 is 120221100112.

It is a cyclic number.

It is not a de Polignac number, because 211001122021 - 2²¹ = 210999024869 is a prime.

It is a super-2 number, since 2×211001122021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211001121992 and 211001122010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211001122027) 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 15 ways as a sum of consecutive naturals, for example, 21772545 + ... + 21782233.

It is an arithmetic number, because the mean of its divisors is an integer number (13892553000).

Almost surely, 2^211001122021 is an apocalyptic number.

It is an amenable number.

211001122021 is a deficient number, since it is larger than the sum of its proper divisors (11279725979).

211001122021 is a wasteful number, since it uses less digits than its factorization.

211001122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18668.

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

Adding to 211001122021 its reverse (120221100112), we get a palindrome (331222222133).

The spelling of 211001122021 in words is "two hundred eleven billion, one million, one hundred twenty-two thousand, twenty-one".