20142306721 has 2 divisors, whose sum is σ = 20142306722. Its totient is φ = 20142306720.

The previous prime is 20142306703. The next prime is 20142306757. The reversal of 20142306721 is 12760324102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18981950625 + 1160356096 = 137775^2 + 34064^2 .

It is a cyclic number.

It is not a de Polignac number, because 20142306721 - 2¹¹ = 20142304673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20142306721.

It is not a weakly prime, because it can be changed into another prime (20142306791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10071153360 + 10071153361.

It is an arithmetic number, because the mean of its divisors is an integer number (10071153361).

Almost surely, 2^20142306721 is an apocalyptic number.

It is an amenable number.

20142306721 is a deficient number, since it is larger than the sum of its proper divisors (1).

20142306721 is an equidigital number, since it uses as much as digits as its factorization.

20142306721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The spelling of 20142306721 in words is "twenty billion, one hundred forty-two million, three hundred six thousand, seven hundred twenty-one".