221271126 has 16 divisors (see below), whose sum is σ = 443661744. Its totient is φ = 73570464.

The previous prime is 221271121. The next prime is 221271139. The reversal of 221271126 is 621172122.

It is a super-2 number, since 2×221271126² = 97921822402615752, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221271096 and 221271105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221271121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44065 + ... + 48828.

It is an arithmetic number, because the mean of its divisors is an integer number (27728859).

Almost surely, 2^221271126 is an apocalyptic number.

221271126 is an abundant number, since it is smaller than the sum of its proper divisors (222390618).

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

221271126 is a wasteful number, since it uses less digits than its factorization.

221271126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93295.

The product of its digits is 672, while the sum is 24.

The square root of 221271126 is about 14875.1849064138. The cubic root of 221271126 is about 604.8415002684.

The spelling of 221271126 in words is "two hundred twenty-one million, two hundred seventy-one thousand, one hundred twenty-six".