131421243 has 16 divisors (see below), whose sum is σ = 183762720. Its totient is φ = 83430144.

The previous prime is 131421239. The next prime is 131421281. The reversal of 131421243 is 342124131.

It is not a de Polignac number, because 131421243 - 2² = 131421239 is a prime.

It is a super-2 number, since 2×131421243² = 34543086223330098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131421293) 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, 3996 + ... + 16697.

It is an arithmetic number, because the mean of its divisors is an integer number (11485170).

Almost surely, 2^131421243 is an apocalyptic number.

131421243 is a deficient number, since it is larger than the sum of its proper divisors (52341477).

131421243 is a wasteful number, since it uses less digits than its factorization.

131421243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20798.

The product of its digits is 576, while the sum is 21.

The square root of 131421243 is about 11463.9104584779. The cubic root of 131421243 is about 508.4190991960.

Adding to 131421243 its reverse (342124131), we get a palindrome (473545374).

The spelling of 131421243 in words is "one hundred thirty-one million, four hundred twenty-one thousand, two hundred forty-three".