21663011533400 has 48 divisors (see below), whose sum is σ = 51727758638640. Its totient is φ = 8431009891200.

The previous prime is 21663011533391. The next prime is 21663011533463. The reversal of 21663011533400 is 433511036612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1463709596 + ... + 1463724395.

It is an arithmetic number, because the mean of its divisors is an integer number (1077661638305).

Almost surely, 2^{21663011533400} is an apocalyptic number.

21663011533400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21663011533400 is an abundant number, since it is smaller than the sum of its proper divisors (30064747105240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21663011533400 is a wasteful number, since it uses less digits than its factorization.

21663011533400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2927434044 (or 2927434035 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The spelling of 21663011533400 in words is "twenty-one trillion, six hundred sixty-three billion, eleven million, five hundred thirty-three thousand, four hundred".