121638927 has 16 divisors (see below), whose sum is σ = 179193600. Its totient is φ = 73003392.

The previous prime is 121638919. The next prime is 121638929. The reversal of 121638927 is 729836121.

It is not a de Polignac number, because 121638927 - 2³ = 121638919 is a prime.

It is a super-2 number, since 2×121638927² = 29592057123422658, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121638929) 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, 50677 + ... + 53022.

It is an arithmetic number, because the mean of its divisors is an integer number (11199600).

Almost surely, 2^121638927 is an apocalyptic number.

121638927 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

121638927 is a deficient number, since it is larger than the sum of its proper divisors (57554673).

121638927 is a wasteful number, since it uses less digits than its factorization.

121638927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103742.

The product of its digits is 36288, while the sum is 39.

The square root of 121638927 is about 11029.0038988115. The cubic root of 121638927 is about 495.4777919090.

The spelling of 121638927 in words is "one hundred twenty-one million, six hundred thirty-eight thousand, nine hundred twenty-seven".