21603433943 has 48 divisors (see below), whose sum is σ = 27847774080. Its totient is φ = 16601356800.

The previous prime is 21603433919. The next prime is 21603433981. The reversal of 21603433943 is 34933430612.

It is a happy number.

It is not a de Polignac number, because 21603433943 - 2¹⁰ = 21603432919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21603433897 and 21603433906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21603430943) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6240233 + ... + 6243693.

It is an arithmetic number, because the mean of its divisors is an integer number (580161960).

Almost surely, 2^21603433943 is an apocalyptic number.

21603433943 is a deficient number, since it is larger than the sum of its proper divisors (6244340137).

21603433943 is a wasteful number, since it uses less digits than its factorization.

21603433943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3768 (or 3761 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 38.

The spelling of 21603433943 in words is "twenty-one billion, six hundred three million, four hundred thirty-three thousand, nine hundred forty-three".