137541021 has 4 divisors (see below), whose sum is σ = 183388032. Its totient is φ = 91694012.

The previous prime is 137541011. The next prime is 137541029. The reversal of 137541021 is 120145731.

137541021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 137541021 - 2⁹ = 137540509 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 137540982 and 137541000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137541029) 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, 22923501 + ... + 22923506.

It is an arithmetic number, because the mean of its divisors is an integer number (45847008).

Almost surely, 2^137541021 is an apocalyptic number.

It is an amenable number.

137541021 is a deficient number, since it is larger than the sum of its proper divisors (45847011).

137541021 is an equidigital number, since it uses as much as digits as its factorization.

137541021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45847010.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 137541021 is about 11727.7884104378. The cubic root of 137541021 is about 516.1913800946.

Adding to 137541021 its reverse (120145731), we get a palindrome (257686752).

The spelling of 137541021 in words is "one hundred thirty-seven million, five hundred forty-one thousand, twenty-one".