20002011212221 has 16 divisors (see below), whose sum is σ = 21053025100800. Its totient is φ = 18983607895728.

The previous prime is 20002011212219. The next prime is 20002011212233. The reversal of 20002011212221 is 12221211020002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20002011212221 - 2¹ = 20002011212219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002011212195 and 20002011212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002011212291) 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, 35320111 + ... + 35881948.

It is an arithmetic number, because the mean of its divisors is an integer number (1315814068800).

Almost surely, 2^{20002011212221} is an apocalyptic number.

It is an amenable number.

20002011212221 is a deficient number, since it is larger than the sum of its proper divisors (1051013888579).

20002011212221 is a wasteful number, since it uses less digits than its factorization.

20002011212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71202288.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20002011212221 its reverse (12221211020002), we get a palindrome (32223222232223).

The spelling of 20002011212221 in words is "twenty trillion, two billion, eleven million, two hundred twelve thousand, two hundred twenty-one".