2220220212521 has 2 divisors, whose sum is σ = 2220220212522. Its totient is φ = 2220220212520.

The previous prime is 2220220212499. The next prime is 2220220212523. The reversal of 2220220212521 is 1252120220222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1372789498921 + 847430713600 = 1171661^2 + 920560^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220220212521 - 2¹⁰ = 2220220211497 is a prime.

Together with 2220220212523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2220220212523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110110106260 + 1110110106261.

It is an arithmetic number, because the mean of its divisors is an integer number (1110110106261).

Almost surely, 2^{2220220212521} is an apocalyptic number.

It is an amenable number.

2220220212521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2220220212521 is an equidigital number, since it uses as much as digits as its factorization.

2220220212521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 2220220212521 its reverse (1252120220222), we get a palindrome (3472340432743).

The spelling of 2220220212521 in words is "two trillion, two hundred twenty billion, two hundred twenty million, two hundred twelve thousand, five hundred twenty-one".