21220130243 has 16 divisors (see below), whose sum is σ = 23392464480. Its totient is φ = 19125275904.

The previous prime is 21220130233. The next prime is 21220130249. The reversal of 21220130243 is 34203102212.

It is a cyclic number.

It is not a de Polignac number, because 21220130243 - 2²⁴ = 21203353027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220130249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2081663 + ... + 2091831.

It is an arithmetic number, because the mean of its divisors is an integer number (1462029030).

Almost surely, 2^21220130243 is an apocalyptic number.

21220130243 is a deficient number, since it is larger than the sum of its proper divisors (2172334237).

21220130243 is a wasteful number, since it uses less digits than its factorization.

21220130243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13958.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21220130243 its reverse (34203102212), we get a palindrome (55423232455).

The spelling of 21220130243 in words is "twenty-one billion, two hundred twenty million, one hundred thirty thousand, two hundred forty-three".