28465202902221 has 24 divisors (see below), whose sum is σ = 41453969183744. Its totient is φ = 18821102328000.

The previous prime is 28465202902189. The next prime is 28465202902273. The reversal of 28465202902221 is 12220920256482.

28465202902221 is a `hidden beast` number, since 2 + 84 + 6 + 520 + 2 + 9 + 0 + 22 + 21 = 666.

It is not a de Polignac number, because 28465202902221 - 2⁵ = 28465202902189 is a prime.

It is a super-2 number, since 2×28465202902221² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28465202902021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 719131 + ... + 7579416.

Almost surely, 2^{28465202902221} is an apocalyptic number.

It is an amenable number.

28465202902221 is a deficient number, since it is larger than the sum of its proper divisors (12988766281523).

28465202902221 is a wasteful number, since it uses less digits than its factorization.

28465202902221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8301681 (or 8301678 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 28465202902221 in words is "twenty-eight trillion, four hundred sixty-five billion, two hundred two million, nine hundred two thousand, two hundred twenty-one".