21222003153121 has 2 divisors, whose sum is σ = 21222003153122. Its totient is φ = 21222003153120.

The previous prime is 21222003153083. The next prime is 21222003153137. The reversal of 21222003153121 is 12135130022212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13447358380096 + 7774644773025 = 3667064^2 + 2788305^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222003153121 - 2²³ = 21221994764513 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222003153151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611001576560 + 10611001576561.

It is an arithmetic number, because the mean of its divisors is an integer number (10611001576561).

Almost surely, 2^{21222003153121} is an apocalyptic number.

It is an amenable number.

21222003153121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222003153121 is an equidigital number, since it uses as much as digits as its factorization.

21222003153121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 21222003153121 its reverse (12135130022212), we get a palindrome (33357133175333).

The spelling of 21222003153121 in words is "twenty-one trillion, two hundred twenty-two billion, three million, one hundred fifty-three thousand, one hundred twenty-one".