21764394454 has 32 divisors (see below), whose sum is σ = 36004165632. Its totient is φ = 9784860000.

The previous prime is 21764394439. The next prime is 21764394473. The reversal of 21764394454 is 45449346712.

It is a super-6 number, since 6×21764394454⁶ (a number of 63 digits) contains 666666 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21764394398 and 21764394407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2410809 + ... + 2419819.

It is an arithmetic number, because the mean of its divisors is an integer number (1125130176).

Almost surely, 2^21764394454 is an apocalyptic number.

21764394454 is a deficient number, since it is larger than the sum of its proper divisors (14239771178).

21764394454 is a wasteful number, since it uses less digits than its factorization.

21764394454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10212.

The product of its digits is 2903040, while the sum is 49.

The spelling of 21764394454 in words is "twenty-one billion, seven hundred sixty-four million, three hundred ninety-four thousand, four hundred fifty-four".