221101131 has 16 divisors (see below), whose sum is σ = 297077760. Its totient is φ = 146268000.

The previous prime is 221101129. The next prime is 221101147. The reversal of 221101131 is 131101122.

It is not a de Polignac number, because 221101131 - 2¹ = 221101129 is a prime.

It is a super-2 number, since 2×221101131² = 97771420258958322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221101631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 360381 + ... + 360993.

It is an arithmetic number, because the mean of its divisors is an integer number (18567360).

Almost surely, 2^221101131 is an apocalyptic number.

221101131 is a deficient number, since it is larger than the sum of its proper divisors (75976629).

221101131 is a wasteful number, since it uses less digits than its factorization.

221101131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 221101131 is about 14869.4697618980. The cubic root of 221101131 is about 604.6865676073.

Adding to 221101131 its reverse (131101122), we get a palindrome (352202253).

Subtracting from 221101131 its reverse (131101122), we obtain a palindrome (90000009).

The spelling of 221101131 in words is "two hundred twenty-one million, one hundred one thousand, one hundred thirty-one".