220221101211021 has 12 divisors (see below), whose sum is σ = 318115708425372. Its totient is φ = 146805500290176.

The previous prime is 220221101210993. The next prime is 220221101211053. The reversal of 220221101211021 is 120112101122022.

220221101211021 is a `hidden beast` number, since 220 + 2 + 211 + 0 + 1 + 211 + 0 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21067053492996 + 199154047718025 = 4589886^2 + 14112195^2 .

It is not a de Polignac number, because 220221101211021 - 2¹⁰ = 220221101209997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220221101210985 and 220221101211003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220221101291021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 713769186 + ... + 714077651.

It is an arithmetic number, because the mean of its divisors is an integer number (26509642368781).

Almost surely, 2^{220221101211021} is an apocalyptic number.

It is an amenable number.

220221101211021 is a deficient number, since it is larger than the sum of its proper divisors (97894607214351).

220221101211021 is a wasteful number, since it uses less digits than its factorization.

220221101211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427863980 (or 1427863977 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 220221101211021 its reverse (120112101122022), we get a palindrome (340333202333043).

The spelling of 220221101211021 in words is "two hundred twenty trillion, two hundred twenty-one billion, one hundred one million, two hundred eleven thousand, twenty-one".