12201022221021 has 6 divisors (see below), whose sum is σ = 17623698763710. Its totient is φ = 8134014814008.

The previous prime is 12201022220993. The next prime is 12201022221127. The reversal of 12201022221021 is 12012222010221.

It is a happy number.

12201022221021 is a `hidden beast` number, since 1 + 220 + 10 + 222 + 210 + 2 + 1 = 666.

12201022221021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 8824197008025 + 3376825212996 = 2970555^2 + 1837614^2 .

It is not a de Polignac number, because 12201022221021 - 2¹³ = 12201022212829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12201022220985 and 12201022221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201022222021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 677834567826 + ... + 677834567843.

It is an arithmetic number, because the mean of its divisors is an integer number (2937283127285).

Almost surely, 2^{12201022221021} is an apocalyptic number.

It is an amenable number.

12201022221021 is a deficient number, since it is larger than the sum of its proper divisors (5422676542689).

12201022221021 is a wasteful number, since it uses less digits than its factorization.

12201022221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355669135675 (or 1355669135672 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12201022221021 its reverse (12012222010221), we get a palindrome (24213244231242).

The spelling of 12201022221021 in words is "twelve trillion, two hundred one billion, twenty-two million, two hundred twenty-one thousand, twenty-one".