220351540021 has 2 divisors, whose sum is σ = 220351540022. Its totient is φ = 220351540020.

The previous prime is 220351539977. The next prime is 220351540051. The reversal of 220351540021 is 120045153022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220158024100 + 193515921 = 469210^2 + 13911^2 .

It is a cyclic number.

It is not a de Polignac number, because 220351540021 - 2⁷ = 220351539893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220351540051) 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, 110175770010 + 110175770011.

It is an arithmetic number, because the mean of its divisors is an integer number (110175770011).

Almost surely, 2^220351540021 is an apocalyptic number.

It is an amenable number.

220351540021 is a deficient number, since it is larger than the sum of its proper divisors (1).

220351540021 is an equidigital number, since it uses as much as digits as its factorization.

220351540021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 220351540021 its reverse (120045153022), we get a palindrome (340396693043).

The spelling of 220351540021 in words is "two hundred twenty billion, three hundred fifty-one million, five hundred forty thousand, twenty-one".