21113123000 has 128 divisors (see below), whose sum is σ = 52118164800. Its totient is φ = 7983360000.

The previous prime is 21113122997. The next prime is 21113123011. The reversal of 21113123000 is 32131112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11722100 + ... + 11723900.

Almost surely, 2^21113123000 is an apocalyptic number.

21113123000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21113123000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26059082400).

21113123000 is an abundant number, since it is smaller than the sum of its proper divisors (31005041800).

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

21113123000 is a wasteful number, since it uses less digits than its factorization.

21113123000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2458 (or 2444 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21113123000 its reverse (32131112), we get a palindrome (21145254112).

The spelling of 21113123000 in words is "twenty-one billion, one hundred thirteen million, one hundred twenty-three thousand".