127212013 has 4 divisors (see below), whose sum is σ = 127237788. Its totient is φ = 127186240.

The previous prime is 127211999. The next prime is 127212073. The reversal of 127212013 is 310212721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50509449 + 76702564 = 7107^2 + 8758^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127212013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127212073) 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, 2908 + ... + 16213.

It is an arithmetic number, because the mean of its divisors is an integer number (31809447).

Almost surely, 2^127212013 is an apocalyptic number.

It is an amenable number.

127212013 is a deficient number, since it is larger than the sum of its proper divisors (25775).

127212013 is an equidigital number, since it uses as much as digits as its factorization.

127212013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25774.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 127212013 is about 11278.8303028284. The cubic root of 127212013 is about 502.9321223722.

Adding to 127212013 its reverse (310212721), we get a palindrome (437424734).

The spelling of 127212013 in words is "one hundred twenty-seven million, two hundred twelve thousand, thirteen".