21663540115454 has 96 divisors (see below), whose sum is σ = 36078974588160. Its totient is φ = 9735495732864.

The previous prime is 21663540115439. The next prime is 21663540115463. The reversal of 21663540115454 is 45451104536612.

It is a super-2 number, since 2×21663540115454² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21663540115399 and 21663540115408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2753719229 + ... + 2753727095.

It is an arithmetic number, because the mean of its divisors is an integer number (375822651960).

Almost surely, 2^{21663540115454} is an apocalyptic number.

21663540115454 is a deficient number, since it is larger than the sum of its proper divisors (14415434472706).

21663540115454 is a wasteful number, since it uses less digits than its factorization.

21663540115454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9262 (or 9243 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 47.

The spelling of 21663540115454 in words is "twenty-one trillion, six hundred sixty-three billion, five hundred forty million, one hundred fifteen thousand, four hundred fifty-four".