28196251421 has 8 divisors (see below), whose sum is σ = 31011262464. Its totient is φ = 25473535920.

The previous prime is 28196251403. The next prime is 28196251429. The reversal of 28196251421 is 12415269182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28196251421 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28196251429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23073245 + ... + 23074466.

It is an arithmetic number, because the mean of its divisors is an integer number (3876407808).

Almost surely, 2^28196251421 is an apocalyptic number.

It is an amenable number.

28196251421 is a deficient number, since it is larger than the sum of its proper divisors (2815011043).

28196251421 is a wasteful number, since it uses less digits than its factorization.

28196251421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46147771.

The product of its digits is 69120, while the sum is 41.

The spelling of 28196251421 in words is "twenty-eight billion, one hundred ninety-six million, two hundred fifty-one thousand, four hundred twenty-one".