21663536224442 has 32 divisors (see below), whose sum is σ = 38418873177600. Its totient is φ = 8964040030848.

The previous prime is 21663536224441. The next prime is 21663536224457. The reversal of 21663536224442 is 24442263536612.

It is a super-3 number, since 3×21663536224442³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21663536224441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20502863 + ... + 21533565.

It is an arithmetic number, because the mean of its divisors is an integer number (1200589786800).

Almost surely, 2^{21663536224442} is an apocalyptic number.

21663536224442 is a deficient number, since it is larger than the sum of its proper divisors (16755336953158).

21663536224442 is a wasteful number, since it uses less digits than its factorization.

21663536224442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082510.

The product of its digits is 9953280, while the sum is 50.

The spelling of 21663536224442 in words is "twenty-one trillion, six hundred sixty-three billion, five hundred thirty-six million, two hundred twenty-four thousand, four hundred forty-two".