221020121200211 has 4 divisors (see below), whose sum is σ = 221020152334800. Its totient is φ = 221020090065624.

The previous prime is 221020121200171. The next prime is 221020121200237. The reversal of 221020121200211 is 112002121020122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221020121200211 is a prime.

It is a super-2 number, since 2×221020121200211² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221020121200211.

It is not an unprimeable number, because it can be changed into a prime (221020121220211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 857525 + ... + 21042233.

It is an arithmetic number, because the mean of its divisors is an integer number (55255038083700).

Almost surely, 2^{221020121200211} is an apocalyptic number.

221020121200211 is a deficient number, since it is larger than the sum of its proper divisors (31134589).

221020121200211 is a wasteful number, since it uses less digits than its factorization.

221020121200211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31134588.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221020121200211 its reverse (112002121020122), we get a palindrome (333022242220333).

The spelling of 221020121200211 in words is "two hundred twenty-one trillion, twenty billion, one hundred twenty-one million, two hundred thousand, two hundred eleven".