20020001222221 has 16 divisors (see below), whose sum is σ = 26880001642368. Its totient is φ = 14400000878400.

The previous prime is 20020001222219. The next prime is 20020001222251. The reversal of 20020001222221 is 12222210002002.

It is a cyclic number.

It is not a de Polignac number, because 20020001222221 - 2¹ = 20020001222219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20020001222195 and 20020001222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020001222251) 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, 9999999610 + ... + 10000001611.

It is an arithmetic number, because the mean of its divisors is an integer number (1680000102648).

Almost surely, 2^{20020001222221} is an apocalyptic number.

It is an amenable number.

20020001222221 is a deficient number, since it is larger than the sum of its proper divisors (6860000420147).

20020001222221 is a wasteful number, since it uses less digits than its factorization.

20020001222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20000001252.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 20020001222221 its reverse (12222210002002), we get a palindrome (32242211224223).

The spelling of 20020001222221 in words is "twenty trillion, twenty billion, one million, two hundred twenty-two thousand, two hundred twenty-one".