28570613021 has 2 divisors, whose sum is σ = 28570613022. Its totient is φ = 28570613020.

The previous prime is 28570613017. The next prime is 28570613033. The reversal of 28570613021 is 12031607582.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26971492900 + 1599120121 = 164230^2 + 39989^2 .

It is a cyclic number.

It is not a de Polignac number, because 28570613021 - 2² = 28570613017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28570613011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14285306510 + 14285306511.

It is an arithmetic number, because the mean of its divisors is an integer number (14285306511).

Almost surely, 2^28570613021 is an apocalyptic number.

It is an amenable number.

28570613021 is a deficient number, since it is larger than the sum of its proper divisors (1).

28570613021 is an equidigital number, since it uses as much as digits as its factorization.

28570613021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 28570613021 in words is "twenty-eight billion, five hundred seventy million, six hundred thirteen thousand, twenty-one".