21533880002 has 8 divisors (see below), whose sum is σ = 32383856700. Its totient is φ = 10739261104.

The previous prime is 21533879999. The next prime is 21533880013. The reversal of 21533880002 is 20008833512.

It can be written as a sum of positive squares in 2 ways, for example, as 17969670601 + 3564209401 = 134051^2 + 59701^2 .

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

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, 13838477 + ... + 13840032.

Almost surely, 2^21533880002 is an apocalyptic number.

21533880002 is a deficient number, since it is larger than the sum of its proper divisors (10849976698).

21533880002 is a wasteful number, since it uses less digits than its factorization.

21533880002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27678900.

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 21533880002 in words is "twenty-one billion, five hundred thirty-three million, eight hundred eighty thousand, two".