4172121 has 8 divisors (see below), whose sum is σ = 6180960. Its totient is φ = 2781396.

The previous prime is 4172117. The next prime is 4172141. The reversal of 4172121 is 1212714.

It is not a de Polignac number, because 4172121 - 2² = 4172117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4172094 and 4172103.

It is not an unprimeable number, because it can be changed into a prime (4172101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77235 + ... + 77288.

It is an arithmetic number, because the mean of its divisors is an integer number (772620).

Almost surely, 2^4172121 is an apocalyptic number.

It is an amenable number.

4172121 is a deficient number, since it is larger than the sum of its proper divisors (2008839).

4172121 is a wasteful number, since it uses less digits than its factorization.

4172121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154532 (or 154526 counting only the distinct ones).

The product of its digits is 112, while the sum is 18.

The square root of 4172121 is about 2042.5770487304. The cubic root of 4172121 is about 160.9850814977.

Adding to 4172121 its reverse (1212714), we get a palindrome (5384835).

The spelling of 4172121 in words is "four million, one hundred seventy-two thousand, one hundred twenty-one".