127921013 has 4 divisors (see below), whose sum is σ = 139550208. Its totient is φ = 116291820.

The previous prime is 127920997. The next prime is 127921019. The reversal of 127921013 is 310129721.

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, and also an emirpimes, since its reverse is a distinct semiprime: 310129721 = 11 ⋅28193611.

It is a cyclic number.

It is not a de Polignac number, because 127921013 - 2⁴ = 127920997 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 (127921019) 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, 5814581 + ... + 5814602.

It is an arithmetic number, because the mean of its divisors is an integer number (34887552).

Almost surely, 2^127921013 is an apocalyptic number.

It is an amenable number.

127921013 is a deficient number, since it is larger than the sum of its proper divisors (11629195).

127921013 is a wasteful number, since it uses less digits than its factorization.

127921013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11629194.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 127921013 is about 11310.2171950852. The cubic root of 127921013 is about 503.8647346858.

The spelling of 127921013 in words is "one hundred twenty-seven million, nine hundred twenty-one thousand, thirteen".