220011021 has 12 divisors (see below), whose sum is σ = 318013020. Its totient is φ = 146572800.

The previous prime is 220010951. The next prime is 220011047. The reversal of 220011021 is 120110022.

It can be written as a sum of positive squares in 2 ways, for example, as 179828100 + 40182921 = 13410^2 + 6339^2 .

It is not a de Polignac number, because 220011021 - 2²⁶ = 152902157 is a prime.

It is a super-2 number, since 2×220011021² = 96809698722924882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 220010994 and 220011012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220051021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6775 + ... + 22043.

It is an arithmetic number, because the mean of its divisors is an integer number (26501085).

Almost surely, 2^220011021 is an apocalyptic number.

It is an amenable number.

220011021 is a deficient number, since it is larger than the sum of its proper divisors (98001999).

220011021 is a wasteful number, since it uses less digits than its factorization.

220011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16876 (or 16873 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 220011021 is about 14832.7684873728. The cubic root of 220011021 is about 603.6911540707.

Adding to 220011021 its reverse (120110022), we get a palindrome (340121043).

Subtracting from 220011021 its reverse (120110022), we obtain a palindrome (99900999).

The spelling of 220011021 in words is "two hundred twenty million, eleven thousand, twenty-one".