12210861 has 16 divisors (see below), whose sum is σ = 18297216. Its totient is φ = 7187136.

The previous prime is 12210857. The next prime is 12210871. The reversal of 12210861 is 16801221.

It is not a de Polignac number, because 12210861 - 2² = 12210857 is a prime.

It is a super-2 number, since 2×12210861² = 298210252722642, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12210871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5910 + ... + 7703.

It is an arithmetic number, because the mean of its divisors is an integer number (1143576).

Almost surely, 2^12210861 is an apocalyptic number.

It is an amenable number.

12210861 is a deficient number, since it is larger than the sum of its proper divisors (6086355).

12210861 is a wasteful number, since it uses less digits than its factorization.

12210861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13652.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 12210861 is about 3494.4042410689. The cubic root of 12210861 is about 230.2760453702.

The spelling of 12210861 in words is "twelve million, two hundred ten thousand, eight hundred sixty-one".