21451082271544 has 32 divisors (see below), whose sum is σ = 42268474519920. Its totient is φ = 10192971833856.

The previous prime is 21451082271527. The next prime is 21451082271583. The reversal of 21451082271544 is 44517228015412.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21451082271494 and 21451082271503.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 842660209 + ... + 842685664.

Almost surely, 2^{21451082271544} is an apocalyptic number.

It is an amenable number.

21451082271544 is a deficient number, since it is larger than the sum of its proper divisors (20817392248376).

21451082271544 is a wasteful number, since it uses less digits than its factorization.

21451082271544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1685345959 (or 1685345955 counting only the distinct ones).

The product of its (nonzero) digits is 716800, while the sum is 46.

The spelling of 21451082271544 in words is "twenty-one trillion, four hundred fifty-one billion, eighty-two million, two hundred seventy-one thousand, five hundred forty-four".