28912121207 has 2 divisors, whose sum is σ = 28912121208. Its totient is φ = 28912121206.

The previous prime is 28912121179. The next prime is 28912121219. The reversal of 28912121207 is 70212121982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28912121207 - 2¹⁶ = 28912055671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28912121257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14456060603 + 14456060604.

It is an arithmetic number, because the mean of its divisors is an integer number (14456060604).

Almost surely, 2^28912121207 is an apocalyptic number.

28912121207 is a deficient number, since it is larger than the sum of its proper divisors (1).

28912121207 is an equidigital number, since it uses as much as digits as its factorization.

28912121207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 35.

The spelling of 28912121207 in words is "twenty-eight billion, nine hundred twelve million, one hundred twenty-one thousand, two hundred seven".