21311003000 has 64 divisors (see below), whose sum is σ = 56991729600. Its totient is φ = 7306627200.

The previous prime is 21311002969. The next prime is 21311003047. The reversal of 21311003000 is 30011312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1515215 + ... + 1529214.

It is an arithmetic number, because the mean of its divisors is an integer number (890495775).

Almost surely, 2^21311003000 is an apocalyptic number.

21311003000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21311003000 is an abundant number, since it is smaller than the sum of its proper divisors (35680726600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21311003000 is a wasteful number, since it uses less digits than its factorization.

21311003000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3044457 (or 3044443 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 21311003000 its reverse (30011312), we get a palindrome (21341014312).

The spelling of 21311003000 in words is "twenty-one billion, three hundred eleven million, three thousand".