21801843103936 has 56 divisors (see below), whose sum is σ = 49448295555840. Its totient is φ = 9342734299392.

The previous prime is 21801843103897. The next prime is 21801843103951. The reversal of 21801843103936 is 63930134810812.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-3 number, since 3×21801843103936³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21801843103936.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2224221 + ... + 6967843.

Almost surely, 2^{21801843103936} is an apocalyptic number.

It is an amenable number.

21801843103936 is an abundant number, since it is smaller than the sum of its proper divisors (27646452451904).

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

21801843103936 is a wasteful number, since it uses less digits than its factorization.

21801843103936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4753901 (or 4753891 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 49.

The spelling of 21801843103936 in words is "twenty-one trillion, eight hundred one billion, eight hundred forty-three million, one hundred three thousand, nine hundred thirty-six".