222121222020001 has 4 divisors (see below), whose sum is σ = 222206098301572. Its totient is φ = 222036345738432.

The previous prime is 222121222019993. The next prime is 222121222020059. The reversal of 222121222020001 is 100020222121222.

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 211117412814400 + 11003809205601 = 14529880^2 + 3317199^2 .

It is a cyclic number.

It is not a de Polignac number, because 222121222020001 - 2³ = 222121222019993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222121222050001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42438136860 + ... + 42438142093.

It is an arithmetic number, because the mean of its divisors is an integer number (55551524575393).

Almost surely, 2^{222121222020001} is an apocalyptic number.

It is an amenable number.

222121222020001 is a deficient number, since it is larger than the sum of its proper divisors (84876281571).

222121222020001 is an equidigital number, since it uses as much as digits as its factorization.

222121222020001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84876281570.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 222121222020001 its reverse (100020222121222), we get a palindrome (322141444141223).

The spelling of 222121222020001 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, two hundred twenty-two million, twenty thousand, one".