12213861 has 12 divisors (see below), whose sum is σ = 17900736. Its totient is φ = 7402120.

The previous prime is 12213857. The next prime is 12213863. The reversal of 12213861 is 16831221.

It is not a de Polignac number, because 12213861 - 2² = 12213857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12213863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16461 + ... + 17186.

It is an arithmetic number, because the mean of its divisors is an integer number (1491728).

Almost surely, 2^12213861 is an apocalyptic number.

12213861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12213861 is a deficient number, since it is larger than the sum of its proper divisors (5686875).

12213861 is a wasteful number, since it uses less digits than its factorization.

12213861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33672 (or 33661 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

The square root of 12213861 is about 3494.8334724275. The cubic root of 12213861 is about 230.2949021231.

The spelling of 12213861 in words is "twelve million, two hundred thirteen thousand, eight hundred sixty-one".