20211112211221 has 32 divisors (see below), whose sum is σ = 21693986496000. Its totient is φ = 18771974793792.

The previous prime is 20211112211219. The next prime is 20211112211261. The reversal of 20211112211221 is 12211221111202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20211112211221 - 2¹ = 20211112211219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211112211261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 657106975 + ... + 657137731.

It is an arithmetic number, because the mean of its divisors is an integer number (677937078000).

Almost surely, 2^{20211112211221} is an apocalyptic number.

It is an amenable number.

20211112211221 is a deficient number, since it is larger than the sum of its proper divisors (1482874284779).

20211112211221 is a wasteful number, since it uses less digits than its factorization.

20211112211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32401.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 20211112211221 its reverse (12211221111202), we get a palindrome (32422333322423).

The spelling of 20211112211221 in words is "twenty trillion, two hundred eleven billion, one hundred twelve million, two hundred eleven thousand, two hundred twenty-one".