12151421 has 4 divisors (see below), whose sum is σ = 12224352. Its totient is φ = 12078492.

The previous prime is 12151417. The next prime is 12151453. The reversal of 12151421 is 12415121.

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.

It is a cyclic number.

It is not a de Polignac number, because 12151421 - 2² = 12151417 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 12151421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12151471) 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, 36215 + ... + 36548.

It is an arithmetic number, because the mean of its divisors is an integer number (3056088).

Almost surely, 2^12151421 is an apocalyptic number.

It is an amenable number.

12151421 is a deficient number, since it is larger than the sum of its proper divisors (72931).

12151421 is an equidigital number, since it uses as much as digits as its factorization.

12151421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72930.

The product of its digits is 80, while the sum is 17.

The square root of 12151421 is about 3485.8888393063. Note that the first 4 decimals coincide. The cubic root of 12151421 is about 229.9017917202.

Adding to 12151421 its reverse (12415121), we get a palindrome (24566542).

The spelling of 12151421 in words is "twelve million, one hundred fifty-one thousand, four hundred twenty-one".