22221551020121 has 2 divisors, whose sum is σ = 22221551020122. Its totient is φ = 22221551020120.

The previous prime is 22221551020099. The next prime is 22221551020199. The reversal of 22221551020121 is 12102015512222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21092296243225 + 1129254776896 = 4592635^2 + 1062664^2 .

It is a cyclic number.

It is not a de Polignac number, because 22221551020121 - 2¹⁸ = 22221550757977 is a prime.

It is not a weakly prime, because it can be changed into another prime (22221551020621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110775510060 + 11110775510061.

It is an arithmetic number, because the mean of its divisors is an integer number (11110775510061).

Almost surely, 2^{22221551020121} is an apocalyptic number.

It is an amenable number.

22221551020121 is a deficient number, since it is larger than the sum of its proper divisors (1).

22221551020121 is an equidigital number, since it uses as much as digits as its factorization.

22221551020121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 26.

Adding to 22221551020121 its reverse (12102015512222), we get a palindrome (34323566532343).

The spelling of 22221551020121 in words is "twenty-two trillion, two hundred twenty-one billion, five hundred fifty-one million, twenty thousand, one hundred twenty-one".