20272121 has 4 divisors (see below), whose sum is σ = 20431872. Its totient is φ = 20112372.

The previous prime is 20272117. The next prime is 20272157. The reversal of 20272121 is 12127202.

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: 12127202 = 2 ⋅6063601.

It is a cyclic number.

It is not a de Polignac number, because 20272121 - 2² = 20272117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20272121.

It is not an unprimeable number, because it can be changed into a prime (20272621) 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, 79685 + ... + 79938.

It is an arithmetic number, because the mean of its divisors is an integer number (5107968).

Almost surely, 2^20272121 is an apocalyptic number.

It is an amenable number.

20272121 is a deficient number, since it is larger than the sum of its proper divisors (159751).

20272121 is a wasteful number, since it uses less digits than its factorization.

20272121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159750.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 20272121 is about 4502.4572180089. The cubic root of 20272121 is about 272.6673034845.

Adding to 20272121 its reverse (12127202), we get a palindrome (32399323).

The spelling of 20272121 in words is "twenty million, two hundred seventy-two thousand, one hundred twenty-one".