220142521 has 2 divisors, whose sum is σ = 220142522. Its totient is φ = 220142520.

The previous prime is 220142519. The next prime is 220142543. The reversal of 220142521 is 125241022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214329600 + 5812921 = 14640^2 + 2411^2 .

It is a cyclic number.

It is not a de Polignac number, because 220142521 - 2¹ = 220142519 is a prime.

Together with 220142519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (220142551) 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, 110071260 + 110071261.

It is an arithmetic number, because the mean of its divisors is an integer number (110071261).

Almost surely, 2^220142521 is an apocalyptic number.

It is an amenable number.

220142521 is a deficient number, since it is larger than the sum of its proper divisors (1).

220142521 is an equidigital number, since it uses as much as digits as its factorization.

220142521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 220142521 is about 14837.2005782762. The cubic root of 220142521 is about 603.8114049798.

Adding to 220142521 its reverse (125241022), we get a palindrome (345383543).

The spelling of 220142521 in words is "two hundred twenty million, one hundred forty-two thousand, five hundred twenty-one".