28701202021 has 2 divisors, whose sum is σ = 28701202022. Its totient is φ = 28701202020.

The previous prime is 28701201979. The next prime is 28701202097. The reversal of 28701202021 is 12020210782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28012716900 + 688485121 = 167370^2 + 26239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28701202021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28701202121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14350601010 + 14350601011.

It is an arithmetic number, because the mean of its divisors is an integer number (14350601011).

Almost surely, 2^28701202021 is an apocalyptic number.

It is an amenable number.

28701202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

28701202021 is an equidigital number, since it uses as much as digits as its factorization.

28701202021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 25.

The spelling of 28701202021 in words is "twenty-eight billion, seven hundred one million, two hundred two thousand, twenty-one".