21331550503 has 8 divisors (see below), whose sum is σ = 22068802800. Its totient is φ = 20594410368.

The previous prime is 21331550497. The next prime is 21331550521. The reversal of 21331550503 is 30505513312.

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

It is a cyclic number.

It is not a de Polignac number, because 21331550503 - 2⁹ = 21331549991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331550543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 590383 + ... + 625471.

It is an arithmetic number, because the mean of its divisors is an integer number (2758600350).

Almost surely, 2^21331550503 is an apocalyptic number.

21331550503 is a deficient number, since it is larger than the sum of its proper divisors (737252297).

21331550503 is a wasteful number, since it uses less digits than its factorization.

21331550503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56081.

The product of its (nonzero) digits is 6750, while the sum is 28.

The spelling of 21331550503 in words is "twenty-one billion, three hundred thirty-one million, five hundred fifty thousand, five hundred three".