21993653733 has 8 divisors (see below), whose sum is σ = 29504779488. Its totient is φ = 14572481904.

The previous prime is 21993653723. The next prime is 21993653743. The reversal of 21993653733 is 33735639912.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21993653723) and next prime (21993653743).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21993653733 - 2⁸ = 21993653477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21993653723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22487910 + ... + 22488887.

It is an arithmetic number, because the mean of its divisors is an integer number (3688097436).

Almost surely, 2^21993653733 is an apocalyptic number.

It is an amenable number.

21993653733 is a deficient number, since it is larger than the sum of its proper divisors (7511125755).

21993653733 is a wasteful number, since it uses less digits than its factorization.

21993653733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44976963.

The product of its digits is 2755620, while the sum is 51.

The spelling of 21993653733 in words is "twenty-one billion, nine hundred ninety-three million, six hundred fifty-three thousand, seven hundred thirty-three".