131421018 has 16 divisors (see below), whose sum is σ = 263004480. Its totient is φ = 43779936.

The previous prime is 131421013. The next prime is 131421053. The reversal of 131421018 is 810124131.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 131420985 and 131421003.

It is not an unprimeable number, because it can be changed into a prime (131421013) 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, 5446 + ... + 17102.

It is an arithmetic number, because the mean of its divisors is an integer number (16437780).

Almost surely, 2^131421018 is an apocalyptic number.

131421018 is an abundant number, since it is smaller than the sum of its proper divisors (131583462).

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

131421018 is a wasteful number, since it uses less digits than its factorization.

131421018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13541.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 131421018 is about 11463.9006450684. The cubic root of 131421018 is about 508.4188090492.

Adding to 131421018 its reverse (810124131), we get a palindrome (941545149).

The spelling of 131421018 in words is "one hundred thirty-one million, four hundred twenty-one thousand, eighteen".