221140031 has 8 divisors (see below), whose sum is σ = 266033280. Its totient is φ = 179572248.

The previous prime is 221139973. The next prime is 221140043. The reversal of 221140031 is 130041122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221140031 - 2⁶ = 221139967 is a prime.

It is a super-2 number, since 2×221140031² = 97805826621361922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221139988 and 221140015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221140091) 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, 831221 + ... + 831486.

It is an arithmetic number, because the mean of its divisors is an integer number (33254160).

Almost surely, 2^221140031 is an apocalyptic number.

221140031 is a deficient number, since it is larger than the sum of its proper divisors (44893249).

221140031 is a wasteful number, since it uses less digits than its factorization.

221140031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662733.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 221140031 is about 14870.7777537021. Note that the first 4 decimals coincide. The cubic root of 221140031 is about 604.7220278935.

Adding to 221140031 its reverse (130041122), we get a palindrome (351181153).

The spelling of 221140031 in words is "two hundred twenty-one million, one hundred forty thousand, thirty-one".