220121145 has 20 divisors (see below), whose sum is σ = 394588260. Its totient is φ = 117397728.

The previous prime is 220121141. The next prime is 220121147. The reversal of 220121145 is 541121022.

220121145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 149157369 + 70963776 = 12213^2 + 8424^2 .

It is not a de Polignac number, because 220121145 - 2² = 220121141 is a prime.

It is a super-2 number, since 2×220121145² = 96906636952222050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (220121141) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 271350 + ... + 272159.

It is an arithmetic number, because the mean of its divisors is an integer number (19729413).

Almost surely, 2^220121145 is an apocalyptic number.

It is an amenable number.

220121145 is a deficient number, since it is larger than the sum of its proper divisors (174467115).

220121145 is an equidigital number, since it uses as much as digits as its factorization.

220121145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543526 (or 543517 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 220121145 is about 14836.4802092680. The cubic root of 220121145 is about 603.7918608373.

Adding to 220121145 its reverse (541121022), we get a palindrome (761242167).

The spelling of 220121145 in words is "two hundred twenty million, one hundred twenty-one thousand, one hundred forty-five".