127008021 has 16 divisors (see below), whose sum is σ = 193693824. Its totient is φ = 72516864.

The previous prime is 127007987. The next prime is 127008029. The reversal of 127008021 is 120800721.

It is not a de Polignac number, because 127008021 - 2⁶ = 127007957 is a prime.

It is a super-2 number, since 2×127008021² = 32262074796672882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127008029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46921 + ... + 49553.

It is an arithmetic number, because the mean of its divisors is an integer number (12105864).

Almost surely, 2^127008021 is an apocalyptic number.

It is an amenable number.

127008021 is a deficient number, since it is larger than the sum of its proper divisors (66685803).

127008021 is a wasteful number, since it uses less digits than its factorization.

127008021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4940.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 127008021 is about 11269.7835382939. The cubic root of 127008021 is about 502.6631513985.

Adding to 127008021 its reverse (120800721), we get a palindrome (247808742).

The spelling of 127008021 in words is "one hundred twenty-seven million, eight thousand, twenty-one".