4021221012481 has 2 divisors, whose sum is σ = 4021221012482. Its totient is φ = 4021221012480.

The previous prime is 4021221012427. The next prime is 4021221012511. The reversal of 4021221012481 is 1842101221204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2803749313600 + 1217471698881 = 1674440^2 + 1103391^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021221012481 - 2¹⁷ = 4021220881409 is a prime.

It is a super-2 number, since 2×4021221012481² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4021221012181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010610506240 + 2010610506241.

It is an arithmetic number, because the mean of its divisors is an integer number (2010610506241).

Almost surely, 2^{4021221012481} is an apocalyptic number.

It is an amenable number.

4021221012481 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021221012481 is an equidigital number, since it uses as much as digits as its factorization.

4021221012481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2048, while the sum is 28.

Adding to 4021221012481 its reverse (1842101221204), we get a palindrome (5863322233685).

The spelling of 4021221012481 in words is "four trillion, twenty-one billion, two hundred twenty-one million, twelve thousand, four hundred eighty-one".