21941663923 has 8 divisors (see below), whose sum is σ = 23150085120. Its totient is φ = 20738602440.

The previous prime is 21941663917. The next prime is 21941663957. The reversal of 21941663923 is 32936614912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21941663923 is a prime.

It is a super-3 number, since 3×21941663923³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21941663963) 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, 1331515 + ... + 1347892.

It is an arithmetic number, because the mean of its divisors is an integer number (2893760640).

Almost surely, 2^21941663923 is an apocalyptic number.

21941663923 is a deficient number, since it is larger than the sum of its proper divisors (1208421197).

21941663923 is a wasteful number, since it uses less digits than its factorization.

21941663923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2679857.

The product of its digits is 419904, while the sum is 46.

The spelling of 21941663923 in words is "twenty-one billion, nine hundred forty-one million, six hundred sixty-three thousand, nine hundred twenty-three".