137503221 has 4 divisors (see below), whose sum is σ = 183337632. Its totient is φ = 91668812.

The previous prime is 137503199. The next prime is 137503237. The reversal of 137503221 is 122305731.

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 a cyclic number.

It is not a de Polignac number, because 137503221 - 2⁵ = 137503189 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 137503191 and 137503200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137503241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22917201 + ... + 22917206.

It is an arithmetic number, because the mean of its divisors is an integer number (45834408).

Almost surely, 2^137503221 is an apocalyptic number.

It is an amenable number.

137503221 is a deficient number, since it is larger than the sum of its proper divisors (45834411).

137503221 is an equidigital number, since it uses as much as digits as its factorization.

137503221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45834410.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 137503221 is about 11726.1767426557. The cubic root of 137503221 is about 516.1440879685.

Adding to 137503221 its reverse (122305731), we get a palindrome (259808952).

The spelling of 137503221 in words is "one hundred thirty-seven million, five hundred three thousand, two hundred twenty-one".