28351362121 has 4 divisors (see below), whose sum is σ = 28352572612. Its totient is φ = 28350151632.

The previous prime is 28351362097. The next prime is 28351362167. The reversal of 28351362121 is 12126315382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27570942025 + 780420096 = 166045^2 + 27936^2 .

It is a cyclic number.

It is not a de Polignac number, because 28351362121 - 2⁹ = 28351361609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28351362181) 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, 569406 + ... + 617191.

It is an arithmetic number, because the mean of its divisors is an integer number (7088143153).

Almost surely, 2^28351362121 is an apocalyptic number.

It is an amenable number.

28351362121 is a deficient number, since it is larger than the sum of its proper divisors (1210491).

28351362121 is a wasteful number, since it uses less digits than its factorization.

28351362121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210490.

The product of its digits is 17280, while the sum is 34.

The spelling of 28351362121 in words is "twenty-eight billion, three hundred fifty-one million, three hundred sixty-two thousand, one hundred twenty-one".