121272621 has 4 divisors (see below), whose sum is σ = 161696832. Its totient is φ = 80848412.

The previous prime is 121272587. The next prime is 121272631. The reversal of 121272621 is 126272121.

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: 126272121 = 3 ⋅42090707.

It is a cyclic number.

It is not a de Polignac number, because 121272621 - 2¹¹ = 121270573 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121272591 and 121272600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121272631) 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, 20212101 + ... + 20212106.

It is an arithmetic number, because the mean of its divisors is an integer number (40424208).

Almost surely, 2^121272621 is an apocalyptic number.

It is an amenable number.

121272621 is a deficient number, since it is larger than the sum of its proper divisors (40424211).

121272621 is an equidigital number, since it uses as much as digits as its factorization.

121272621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40424210.

The product of its digits is 672, while the sum is 24.

The square root of 121272621 is about 11012.3848915664. The cubic root of 121272621 is about 494.9799277648.

The spelling of 121272621 in words is "one hundred twenty-one million, two hundred seventy-two thousand, six hundred twenty-one".