20211200212221 has 16 divisors (see below), whose sum is σ = 29942735475520. Its totient is φ = 13474035985680.

The previous prime is 20211200212129. The next prime is 20211200212223. The reversal of 20211200212221 is 12221200211202.

It is a happy number.

20211200212221 is a `hidden beast` number, since 2 + 0 + 211 + 20 + 0 + 212 + 221 = 666.

It is not a de Polignac number, because 20211200212221 - 2¹⁹ = 20211199687933 is a prime.

It is a super-2 number, since 2×20211200212221² (a number of 27 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 = 20211200212194 and 20211200212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211200212223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1195071 + ... + 6469203.

It is an arithmetic number, because the mean of its divisors is an integer number (1871420967220).

Almost surely, 2^{20211200212221} is an apocalyptic number.

It is an amenable number.

20211200212221 is a deficient number, since it is larger than the sum of its proper divisors (9731535263299).

20211200212221 is a wasteful number, since it uses less digits than its factorization.

20211200212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5416073 (or 5416067 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20211200212221 its reverse (12221200211202), we get a palindrome (32432400423423).

The spelling of 20211200212221 in words is "twenty trillion, two hundred eleven billion, two hundred million, two hundred twelve thousand, two hundred twenty-one".