21203111000 has 64 divisors (see below), whose sum is σ = 49638307680. Its totient is φ = 8477308800.

The previous prime is 21203110969. The next prime is 21203111003. The reversal of 21203111000 is 11130212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203111003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3183674 + ... + 3190326.

Almost surely, 2^21203111000 is an apocalyptic number.

21203111000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21203111000 is an abundant number, since it is smaller than the sum of its proper divisors (28435196680).

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

21203111000 is a wasteful number, since it uses less digits than its factorization.

21203111000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9861 (or 9847 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21203111000 its reverse (11130212), we get a palindrome (21214241212).

The spelling of 21203111000 in words is "twenty-one billion, two hundred three million, one hundred eleven thousand".