21663550454012 has 6 divisors (see below), whose sum is σ = 37911213294528. Its totient is φ = 10831775227004.

The previous prime is 21663550454011. The next prime is 21663550454071. The reversal of 21663550454012 is 21045405536612.

It is a super-2 number, since 2×21663550454012² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21663550454011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2707943806748 + ... + 2707943806755.

It is an arithmetic number, because the mean of its divisors is an integer number (6318535549088).

Almost surely, 2^{21663550454012} is an apocalyptic number.

It is an amenable number.

21663550454012 is a deficient number, since it is larger than the sum of its proper divisors (16247662840516).

21663550454012 is a wasteful number, since it uses less digits than its factorization.

21663550454012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5415887613507 (or 5415887613505 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 21663550454012 in words is "twenty-one trillion, six hundred sixty-three billion, five hundred fifty million, four hundred fifty-four thousand, twelve".