21004033552 has 20 divisors (see below), whose sum is σ = 40939004736. Its totient is φ = 10439129120.

The previous prime is 21004033543. The next prime is 21004033621. The reversal of 21004033552 is 25533040012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3927724 + ... + 3933067.

Almost surely, 2^21004033552 is an apocalyptic number.

It is an amenable number.

21004033552 is a deficient number, since it is larger than the sum of its proper divisors (19934971184).

21004033552 is a wasteful number, since it uses less digits than its factorization.

21004033552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7860966 (or 7860960 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 21004033552 its reverse (25533040012), we get a palindrome (46537073564).

The spelling of 21004033552 in words is "twenty-one billion, four million, thirty-three thousand, five hundred fifty-two".