2221123213021 has 2 divisors, whose sum is σ = 2221123213022. Its totient is φ = 2221123213020.

The previous prime is 2221123212967. The next prime is 2221123213039. The reversal of 2221123213021 is 1203123211222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1551491956921 + 669631256100 = 1245589^2 + 818310^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221123213021 - 2¹⁵ = 2221123180253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2221123212983 and 2221123213001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221123213091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110561606510 + 1110561606511.

It is an arithmetic number, because the mean of its divisors is an integer number (1110561606511).

Almost surely, 2^{2221123213021} is an apocalyptic number.

It is an amenable number.

2221123213021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221123213021 is an equidigital number, since it uses as much as digits as its factorization.

2221123213021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 2221123213021 its reverse (1203123211222), we get a palindrome (3424246424243).

The spelling of 2221123213021 in words is "two trillion, two hundred twenty-one billion, one hundred twenty-three million, two hundred thirteen thousand, twenty-one".