12199021 has 2 divisors, whose sum is σ = 12199022.
Its totient is φ = 12199020.
The previous prime is 12199001. The next prime is 12199037. The reversal of 12199021 is 12099121.
12199021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 9066121 + 3132900 = 3011^2 + 1770^2
It is a cyclic number.
It is not a de Polignac number, because 12199021 - 29 = 12198509 is a prime.
It is a super-2 number, since 2×121990212 = 297632226716882, which contains 22 as substring.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (12199001) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6099510 + 6099511.
It is an arithmetic number, because the mean of its divisors is an integer number (6099511).
Almost surely, 212199021 is an apocalyptic number.
It is an amenable number.
12199021 is a deficient number, since it is larger than the sum of its proper divisors (1).
12199021 is an equidigital number, since it uses as much as digits as its factorization.
12199021 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 324, while the sum is 25.
The square root of 12199021 is about 3492.7096930607.
The cubic root of 12199021 is about 230.2015938887.
The spelling of 12199021 in words is "twelve million, one hundred ninety-nine thousand, twenty-one".