12201971 has 16 divisors (see below), whose sum is σ = 13980960. Its totient is φ = 10575360.

The previous prime is 12201961. The next prime is 12201991. The reversal of 12201971 is 17910221.

It is not a de Polignac number, because 12201971 - 2²² = 8007667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12201901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11441 + ... + 12461.

It is an arithmetic number, because the mean of its divisors is an integer number (873810).

Almost surely, 2^12201971 is an apocalyptic number.

12201971 is a deficient number, since it is larger than the sum of its proper divisors (1778989).

12201971 is a wasteful number, since it uses less digits than its factorization.

12201971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 12201971 is about 3493.1319757490. The cubic root of 12201971 is about 230.2201483823.

The spelling of 12201971 in words is "twelve million, two hundred one thousand, nine hundred seventy-one".