12616021 has 4 divisors (see below), whose sum is σ = 13762944. Its totient is φ = 11469100.

The previous prime is 12616007. The next prime is 12616027. The reversal of 12616021 is 12061621.

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 12616021 - 2⁷ = 12615893 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 12616021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12616027) 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, 573445 + ... + 573466.

It is an arithmetic number, because the mean of its divisors is an integer number (3440736).

Almost surely, 2^12616021 is an apocalyptic number.

12616021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12616021 is a deficient number, since it is larger than the sum of its proper divisors (1146923).

12616021 is a wasteful number, since it uses less digits than its factorization.

12616021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146922.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 12616021 is about 3551.9038556808. The cubic root of 12616021 is about 232.7952605976.

Adding to 12616021 its reverse (12061621), we get a palindrome (24677642).

The spelling of 12616021 in words is "twelve million, six hundred sixteen thousand, twenty-one".