220020001221 has 16 divisors (see below), whose sum is σ = 311615261568. Its totient is φ = 137607859200.

The previous prime is 220020001171. The next prime is 220020001237. The reversal of 220020001221 is 122100020022.

It is not a de Polignac number, because 220020001221 - 2¹⁴ = 220019984837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220020001197 and 220020001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220020001021) 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, 6920020 + ... + 6951741.

It is an arithmetic number, because the mean of its divisors is an integer number (19475953848).

Almost surely, 2^220020001221 is an apocalyptic number.

It is an amenable number.

220020001221 is a deficient number, since it is larger than the sum of its proper divisors (91595260347).

220020001221 is a wasteful number, since it uses less digits than its factorization.

220020001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13872092.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 220020001221 its reverse (122100020022), we get a palindrome (342120021243).

The spelling of 220020001221 in words is "two hundred twenty billion, twenty million, one thousand, two hundred twenty-one".