20200010020721 has 2 divisors, whose sum is σ = 20200010020722. Its totient is φ = 20200010020720.

The previous prime is 20200010020709. The next prime is 20200010020733. The reversal of 20200010020721 is 12702001000202.

It is a balanced prime because it is at equal distance from previous prime (20200010020709) and next prime (20200010020733).

It can be written as a sum of positive squares in only one way, i.e., 15992440893025 + 4207569127696 = 3999055^2 + 2051236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20200010020721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20200010020721.

It is not a weakly prime, because it can be changed into another prime (20200010020781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100005010360 + 10100005010361.

It is an arithmetic number, because the mean of its divisors is an integer number (10100005010361).

Almost surely, 2^{20200010020721} is an apocalyptic number.

It is an amenable number.

20200010020721 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200010020721 is an equidigital number, since it uses as much as digits as its factorization.

20200010020721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 17.

Adding to 20200010020721 its reverse (12702001000202), we get a palindrome (32902011020923).

The spelling of 20200010020721 in words is "twenty trillion, two hundred billion, ten million, twenty thousand, seven hundred twenty-one".