28212971 has 2 divisors, whose sum is σ = 28212972. Its totient is φ = 28212970.

The previous prime is 28212959. The next prime is 28213067. The reversal of 28212971 is 17921282.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28212971 - 2¹⁰ = 28211947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28212941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14106485 + 14106486.

It is an arithmetic number, because the mean of its divisors is an integer number (14106486).

Almost surely, 2^28212971 is an apocalyptic number.

28212971 is a deficient number, since it is larger than the sum of its proper divisors (1).

28212971 is an equidigital number, since it uses as much as digits as its factorization.

28212971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 32.

The square root of 28212971 is about 5311.5883688403. The cubic root of 28212971 is about 304.4268408145.

The spelling of 28212971 in words is "twenty-eight million, two hundred twelve thousand, nine hundred seventy-one".