28912121201 has 4 divisors (see below), whose sum is σ = 29844770304. Its totient is φ = 27979472100.

The previous prime is 28912121179. The next prime is 28912121207. The reversal of 28912121201 is 10212121982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10212121982 = 2 ⋅5106060991.

It is a cyclic number.

It is not a de Polignac number, because 28912121201 - 2¹⁴ = 28912104817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28912121207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466324505 + ... + 466324566.

It is an arithmetic number, because the mean of its divisors is an integer number (7461192576).

Almost surely, 2^28912121201 is an apocalyptic number.

It is an amenable number.

28912121201 is a deficient number, since it is larger than the sum of its proper divisors (932649103).

28912121201 is an equidigital number, since it uses as much as digits as its factorization.

28912121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932649102.

The product of its (nonzero) digits is 1152, while the sum is 29.

The spelling of 28912121201 in words is "twenty-eight billion, nine hundred twelve million, one hundred twenty-one thousand, two hundred one".