20012021212221 has 16 divisors (see below), whose sum is σ = 29668630768000. Its totient is φ = 13331811104064.

The previous prime is 20012021212219. The next prime is 20012021212229. The reversal of 20012021212221 is 12221212021002.

It is a happy number.

20012021212221 is a `hidden beast` number, since 200 + 1 + 20 + 212 + 12 + 221 = 666.

It is not a de Polignac number, because 20012021212221 - 2¹ = 20012021212219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20012021212194 and 20012021212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012021212229) 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, 264860716 + ... + 264936261.

It is an arithmetic number, because the mean of its divisors is an integer number (1854289423000).

Almost surely, 2^{20012021212221} is an apocalyptic number.

It is an amenable number.

20012021212221 is a deficient number, since it is larger than the sum of its proper divisors (9656609555779).

20012021212221 is a wasteful number, since it uses less digits than its factorization.

20012021212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529798385 (or 529798379 counting only the distinct ones).

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

Adding to 20012021212221 its reverse (12221212021002), we get a palindrome (32233233233223).

The spelling of 20012021212221 in words is "twenty trillion, twelve billion, twenty-one million, two hundred twelve thousand, two hundred twenty-one".