22021021121201 has 4 divisors (see below), whose sum is σ = 22268448324900. Its totient is φ = 21773593917504.

The previous prime is 22021021121173. The next prime is 22021021121227. The reversal of 22021021121201 is 10212112012022.

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 15450001561201 + 6571019560000 = 3930649^2 + 2563400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22021021121201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22021021121201.

It is not an unprimeable number, because it can be changed into a prime (22021027121201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123713601716 + ... + 123713601893.

It is an arithmetic number, because the mean of its divisors is an integer number (5567112081225).

Almost surely, 2^{22021021121201} is an apocalyptic number.

It is an amenable number.

22021021121201 is a deficient number, since it is larger than the sum of its proper divisors (247427203699).

22021021121201 is an equidigital number, since it uses as much as digits as its factorization.

22021021121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247427203698.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 22021021121201 its reverse (10212112012022), we get a palindrome (32233133133223).

The spelling of 22021021121201 in words is "twenty-two trillion, twenty-one billion, twenty-one million, one hundred twenty-one thousand, two hundred one".