127300021 has 4 divisors (see below), whose sum is σ = 127946412. Its totient is φ = 126653632.

The previous prime is 127300013. The next prime is 127300027. The reversal of 127300021 is 120003721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120003721 = 2741 ⋅43781.

It can be written as a sum of positive squares in 2 ways, for example, as 67469796 + 59830225 = 8214^2 + 7735^2 .

It is a cyclic number.

It is not a de Polignac number, because 127300021 - 2³ = 127300013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 127299968 and 127300004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127300027) 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, 322900 + ... + 323293.

It is an arithmetic number, because the mean of its divisors is an integer number (31986603).

Almost surely, 2^127300021 is an apocalyptic number.

It is an amenable number.

127300021 is a deficient number, since it is larger than the sum of its proper divisors (646391).

127300021 is an equidigital number, since it uses as much as digits as its factorization.

127300021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646390.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 127300021 is about 11282.7310966804. The cubic root of 127300021 is about 503.0480753810.

Adding to 127300021 its reverse (120003721), we get a palindrome (247303742).

The spelling of 127300021 in words is "one hundred twenty-seven million, three hundred thousand, twenty-one".