221707122 has 64 divisors (see below), whose sum is σ = 547513344. Its totient is φ = 58282560.

The previous prime is 221707093. The next prime is 221707127.

221707122 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 221707092 and 221707101.

It is not an unprimeable number, because it can be changed into a prime (221707127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 267673 + ... + 268499.

It is an arithmetic number, because the mean of its divisors is an integer number (8554896).

Almost surely, 2^221707122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221707122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273756672).

221707122 is an abundant number, since it is smaller than the sum of its proper divisors (325806222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221707122 is a wasteful number, since it uses less digits than its factorization.

221707122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343.

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 221707122 is about 14889.8328398945. The cubic root of 221707122 is about 605.2385026004.

It can be divided in two parts, 22170 and 7122, that added together give a palindrome (29292).

The spelling of 221707122 in words is "two hundred twenty-one million, seven hundred seven thousand, one hundred twenty-two".