12201021021 has 12 divisors (see below), whose sum is σ = 18924032832. Its totient is φ = 6972011928.

The previous prime is 12201021011. The next prime is 12201021031. The reversal of 12201021021 is 12012010221.

It is an interprime number because it is at equal distance from previous prime (12201021011) and next prime (12201021031).

It is not a de Polignac number, because 12201021021 - 2⁷ = 12201020893 is a prime.

It is a super-3 number, since 3×12201021021³ (a number of 31 digits) contains 333 as substring.

12201021021 is a modest number, since divided by 21021 gives 12201 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 12201020988 and 12201021006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201021011) 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, 41499925 + ... + 41500218.

It is an arithmetic number, because the mean of its divisors is an integer number (1577002736).

Almost surely, 2^12201021021 is an apocalyptic number.

It is an amenable number.

12201021021 is a deficient number, since it is larger than the sum of its proper divisors (6723011811).

12201021021 is an equidigital number, since it uses as much as digits as its factorization.

12201021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83000160 (or 83000153 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12201021021 its reverse (12012010221), we get a palindrome (24213031242).

The spelling of 12201021021 in words is "twelve billion, two hundred one million, twenty-one thousand, twenty-one".