12121347 has 16 divisors (see below), whose sum is σ = 18865152. Its totient is φ = 6778560.

The previous prime is 12121337. The next prime is 12121367. The reversal of 12121347 is 74312121.

12121347 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12121347 - 2⁴ = 12121331 is a prime.

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

12121347 is strictly pandigital in base 8.

It is not an unprimeable number, because it can be changed into a prime (12121327) 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, 5154 + ... + 7127.

It is an arithmetic number, because the mean of its divisors is an integer number (1179072).

Almost surely, 2^12121347 is an apocalyptic number.

12121347 is a deficient number, since it is larger than the sum of its proper divisors (6743805).

12121347 is a wasteful number, since it uses less digits than its factorization.

12121347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12338.

The product of its digits is 336, while the sum is 21.

The square root of 12121347 is about 3481.5724895512. The cubic root of 12121347 is about 229.7119708946.

Adding to 12121347 its reverse (74312121), we get a palindrome (86433468).

The spelling of 12121347 in words is "twelve million, one hundred twenty-one thousand, three hundred forty-seven".