220012012721 has 2 divisors, whose sum is σ = 220012012722. Its totient is φ = 220012012720.

The previous prime is 220012012711. The next prime is 220012012739. The reversal of 220012012721 is 127210210022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207994372096 + 12017640625 = 456064^2 + 109625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220012012721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220012012693 and 220012012702.

It is not a weakly prime, because it can be changed into another prime (220012012711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110006006360 + 110006006361.

It is an arithmetic number, because the mean of its divisors is an integer number (110006006361).

Almost surely, 2^220012012721 is an apocalyptic number.

It is an amenable number.

220012012721 is a deficient number, since it is larger than the sum of its proper divisors (1).

220012012721 is an equidigital number, since it uses as much as digits as its factorization.

220012012721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 220012012721 its reverse (127210210022), we get a palindrome (347222222743).

The spelling of 220012012721 in words is "two hundred twenty billion, twelve million, twelve thousand, seven hundred twenty-one".