131421105 has 12 divisors (see below), whose sum is σ = 227796660. Its totient is φ = 70091232.

The previous prime is 131421091. The next prime is 131421109. The reversal of 131421105 is 501124131.

It can be written as a sum of positive squares in 2 ways, for example, as 48902049 + 82519056 = 6993^2 + 9084^2 .

It is not a de Polignac number, because 131421105 - 2⁹ = 131420593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131421109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1460190 + ... + 1460279.

It is an arithmetic number, because the mean of its divisors is an integer number (18983055).

Almost surely, 2^131421105 is an apocalyptic number.

131421105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131421105 is a deficient number, since it is larger than the sum of its proper divisors (96375555).

131421105 is a wasteful number, since it uses less digits than its factorization.

131421105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920480 (or 2920477 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 131421105 is about 11463.9044395878. The cubic root of 131421105 is about 508.4189212393.

Adding to 131421105 its reverse (501124131), we get a palindrome (632545236).

The spelling of 131421105 in words is "one hundred thirty-one million, four hundred twenty-one thousand, one hundred five".