12215901 has 4 divisors (see below), whose sum is σ = 16287872. Its totient is φ = 8143932.

The previous prime is 12215899. The next prime is 12215933. The reversal of 12215901 is 10951221.

12215901 is nontrivially palindromic in base 2.

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 not a de Polignac number, because 12215901 - 2¹ = 12215899 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215971) 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, 2035981 + ... + 2035986.

It is an arithmetic number, because the mean of its divisors is an integer number (4071968).

Almost surely, 2^12215901 is an apocalyptic number.

It is an amenable number.

12215901 is a deficient number, since it is larger than the sum of its proper divisors (4071971).

12215901 is an equidigital number, since it uses as much as digits as its factorization.

12215901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4071970.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 12215901 is about 3495.1253196416. The cubic root of 12215901 is about 230.3077229515.

The spelling of 12215901 in words is "twelve million, two hundred fifteen thousand, nine hundred one".