12201220012021 has 4 divisors (see below), whose sum is σ = 12201969811372. Its totient is φ = 12200470212672.

The previous prime is 12201220011941. The next prime is 12201220012031. The reversal of 12201220012021 is 12021002210221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11367214540900 + 834005471121 = 3371530^2 + 913239^2 .

It is a cyclic number.

It is not a de Polignac number, because 12201220012021 - 2²¹ = 12201217914869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12201220011986 and 12201220012004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201220012031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374875266 + ... + 374907811.

It is an arithmetic number, because the mean of its divisors is an integer number (3050492452843).

Almost surely, 2^{12201220012021} is an apocalyptic number.

It is an amenable number.

12201220012021 is a deficient number, since it is larger than the sum of its proper divisors (749799351).

12201220012021 is an equidigital number, since it uses as much as digits as its factorization.

12201220012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749799350.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12201220012021 its reverse (12021002210221), we get a palindrome (24222222222242).

The spelling of 12201220012021 in words is "twelve trillion, two hundred one billion, two hundred twenty million, twelve thousand, twenty-one".