21533343441004 has 24 divisors (see below), whose sum is σ = 39666917608640. Its totient is φ = 10199945047824.

The previous prime is 21533343440993. The next prime is 21533343441037. The reversal of 21533343441004 is 40014434333512.

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, 13953367 + ... + 15419569.

Almost surely, 2^{21533343441004} is an apocalyptic number.

It is an amenable number.

21533343441004 is a deficient number, since it is larger than the sum of its proper divisors (18133574167636).

21533343441004 is a wasteful number, since it uses less digits than its factorization.

21533343441004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1659469 (or 1659467 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 37.

Adding to 21533343441004 its reverse (40014434333512), we get a palindrome (61547777774516).

The spelling of 21533343441004 in words is "twenty-one trillion, five hundred thirty-three billion, three hundred forty-three million, four hundred forty-one thousand, four".