137143221 has 4 divisors (see below), whose sum is σ = 182857632. Its totient is φ = 91428812.

The previous prime is 137143213. The next prime is 137143229. The reversal of 137143221 is 122341731.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (137143213) and next prime (137143229).

It is a cyclic number.

It is not a de Polignac number, because 137143221 - 2³ = 137143213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 137143191 and 137143200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137143229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22857201 + ... + 22857206.

It is an arithmetic number, because the mean of its divisors is an integer number (45714408).

Almost surely, 2^137143221 is an apocalyptic number.

It is an amenable number.

137143221 is a deficient number, since it is larger than the sum of its proper divisors (45714411).

137143221 is an equidigital number, since it uses as much as digits as its factorization.

137143221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45714410.

The product of its digits is 1008, while the sum is 24.

The square root of 137143221 is about 11710.8164104814. The cubic root of 137143221 is about 515.6932518211.

Adding to 137143221 its reverse (122341731), we get a palindrome (259484952).

The spelling of 137143221 in words is "one hundred thirty-seven million, one hundred forty-three thousand, two hundred twenty-one".