20020221221 has 16 divisors (see below), whose sum is σ = 26880298368. Its totient is φ = 14400158400.

The previous prime is 20020221211. The next prime is 20020221301. The reversal of 20020221221 is 12212202002.

It is a cyclic number.

It is not a de Polignac number, because 20020221221 - 2¹⁰ = 20020220197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20020221196 and 20020221205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020221211) 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, 9999110 + ... + 10001111.

It is an arithmetic number, because the mean of its divisors is an integer number (1680018648).

Almost surely, 2^20020221221 is an apocalyptic number.

It is an amenable number.

20020221221 is a deficient number, since it is larger than the sum of its proper divisors (6860077147).

20020221221 is a wasteful number, since it uses less digits than its factorization.

20020221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20000252.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20020221221 its reverse (12212202002), we get a palindrome (32232423223).

The spelling of 20020221221 in words is "twenty billion, twenty million, two hundred twenty-one thousand, two hundred twenty-one".