21693061268238 has 8 divisors (see below), whose sum is σ = 43386122536488. Its totient is φ = 7231020422744.

The previous prime is 21693061268209. The next prime is 21693061268239. The reversal of 21693061268238 is 83286216039612.

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

21693061268238 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21693061268239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1807755105681 + ... + 1807755105692.

It is an arithmetic number, because the mean of its divisors is an integer number (5423265317061).

Almost surely, 2^{21693061268238} is an apocalyptic number.

21693061268238 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21693061268238 is a wasteful number, since it uses less digits than its factorization.

21693061268238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3615510211378.

The product of its (nonzero) digits is 8957952, while the sum is 57.

The spelling of 21693061268238 in words is "twenty-one trillion, six hundred ninety-three billion, sixty-one million, two hundred sixty-eight thousand, two hundred thirty-eight".