21556451422 has 16 divisors (see below), whose sum is σ = 35280225792. Its totient is φ = 9796711320.

The previous prime is 21556451351. The next prime is 21556451443. The reversal of 21556451422 is 22415465512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52723 + ... + 214225.

It is an arithmetic number, because the mean of its divisors is an integer number (2205014112).

Almost surely, 2^21556451422 is an apocalyptic number.

21556451422 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21556451422 is a deficient number, since it is larger than the sum of its proper divisors (13723774370).

21556451422 is a wasteful number, since it uses less digits than its factorization.

21556451422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167583.

The product of its digits is 96000, while the sum is 37.

The spelling of 21556451422 in words is "twenty-one billion, five hundred fifty-six million, four hundred fifty-one thousand, four hundred twenty-two".