21428499455 has 8 divisors (see below), whose sum is σ = 28051853904. Its totient is φ = 15584363200.

The previous prime is 21428499451. The next prime is 21428499467. The reversal of 21428499455 is 55499482412.

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

It is not a de Polignac number, because 21428499455 - 2² = 21428499451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21428499397 and 21428499406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21428499451) 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, 194804486 + ... + 194804595.

It is an arithmetic number, because the mean of its divisors is an integer number (3506481738).

Almost surely, 2^21428499455 is an apocalyptic number.

21428499455 is a deficient number, since it is larger than the sum of its proper divisors (6623354449).

21428499455 is a wasteful number, since it uses less digits than its factorization.

21428499455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389609097.

The product of its digits is 4147200, while the sum is 53.

The spelling of 21428499455 in words is "twenty-one billion, four hundred twenty-eight million, four hundred ninety-nine thousand, four hundred fifty-five".