21031745651633 has 8 divisors (see below), whose sum is σ = 21762120665280. Its totient is φ = 20301713465040.

The previous prime is 21031745651629. The next prime is 21031745651647. The reversal of 21031745651633 is 33615654713012.

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

It is a cyclic number.

It is not a de Polignac number, because 21031745651633 - 2² = 21031745651629 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031745651603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85581935 + ... + 85827332.

It is an arithmetic number, because the mean of its divisors is an integer number (2720265083160).

Almost surely, 2^{21031745651633} is an apocalyptic number.

It is an amenable number.

21031745651633 is a deficient number, since it is larger than the sum of its proper divisors (730375013647).

21031745651633 is a wasteful number, since it uses less digits than its factorization.

21031745651633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171413527.

The product of its (nonzero) digits is 1360800, while the sum is 47.

The spelling of 21031745651633 in words is "twenty-one trillion, thirty-one billion, seven hundred forty-five million, six hundred fifty-one thousand, six hundred thirty-three".