21147282455 has 8 divisors (see below), whose sum is σ = 27328795872. Its totient is φ = 15616454688.

The previous prime is 21147282439. The next prime is 21147282467. The reversal of 21147282455 is 55428274112.

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

It is a cyclic number.

It is not a de Polignac number, because 21147282455 - 2⁴ = 21147282439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162671339 + ... + 162671468.

It is an arithmetic number, because the mean of its divisors is an integer number (3416099484).

Almost surely, 2^21147282455 is an apocalyptic number.

21147282455 is a deficient number, since it is larger than the sum of its proper divisors (6181513417).

21147282455 is a wasteful number, since it uses less digits than its factorization.

21147282455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325342825.

The product of its digits is 179200, while the sum is 41.

The spelling of 21147282455 in words is "twenty-one billion, one hundred forty-seven million, two hundred eighty-two thousand, four hundred fifty-five".