20012212221 has 16 divisors (see below), whose sum is σ = 26733517824. Its totient is φ = 13316217264.

The previous prime is 20012212151. The next prime is 20012212261. The reversal of 20012212221 is 12221221002.

It is not a de Polignac number, because 20012212221 - 2¹¹ = 20012210173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20012212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012212261) 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, 5367660 + ... + 5371386.

It is an arithmetic number, because the mean of its divisors is an integer number (1670844864).

Almost surely, 2^20012212221 is an apocalyptic number.

It is an amenable number.

20012212221 is a deficient number, since it is larger than the sum of its proper divisors (6721305603).

20012212221 is a wasteful number, since it uses less digits than its factorization.

20012212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6640.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20012212221 its reverse (12221221002), we get a palindrome (32233433223).

The spelling of 20012212221 in words is "twenty billion, twelve million, two hundred twelve thousand, two hundred twenty-one".