20211222121201 has 2 divisors, whose sum is σ = 20211222121202. Its totient is φ = 20211222121200.

The previous prime is 20211222121199. The next prime is 20211222121261. The reversal of 20211222121201 is 10212122211202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19742203968400 + 469018152801 = 4443220^2 + 684849^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211222121201 - 2¹ = 20211222121199 is a prime.

Together with 20211222121199, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20211222121261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105611060600 + 10105611060601.

It is an arithmetic number, because the mean of its divisors is an integer number (10105611060601).

Almost surely, 2^{20211222121201} is an apocalyptic number.

It is an amenable number.

20211222121201 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211222121201 is an equidigital number, since it uses as much as digits as its factorization.

20211222121201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20211222121201 its reverse (10212122211202), we get a palindrome (30423344332403).

Subtracting from 20211222121201 its reverse (10212122211202), we obtain a palindrome (9999099909999).

The spelling of 20211222121201 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred one".