12201212021 has 12 divisors (see below), whose sum is σ = 12721390500. Its totient is φ = 11701296768.

The previous prime is 12201212003. The next prime is 12201212039. The reversal of 12201212021 is 12021210221.

It is an interprime number because it is at equal distance from previous prime (12201212003) and next prime (12201212039).

It can be written as a sum of positive squares in 6 ways, for example, as 404211025 + 11797000996 = 20105^2 + 108614^2 .

It is not a de Polignac number, because 12201212021 - 2¹⁰ = 12201210997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12201211987 and 12201212005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201212071) 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, 76625 + ... + 173993.

It is an arithmetic number, because the mean of its divisors is an integer number (1060115875).

Almost surely, 2^12201212021 is an apocalyptic number.

It is an amenable number.

12201212021 is a deficient number, since it is larger than the sum of its proper divisors (520178479).

12201212021 is an equidigital number, since it uses as much as digits as its factorization.

12201212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97576 (or 97547 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12201212021 its reverse (12021210221), we get a palindrome (24222422242).

The spelling of 12201212021 in words is "twelve billion, two hundred one million, two hundred twelve thousand, twenty-one".