21126903000 has 1024 divisors, whose sum is σ = 86951854080. Its totient is φ = 4156416000.

The previous prime is 21126902987. The next prime is 21126903011. The reversal of 21126903000 is 30962112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 254540959 + ... + 254541041.

It is an arithmetic number, because the mean of its divisors is an integer number (84913920).

Almost surely, 2^21126903000 is an apocalyptic number.

21126903000 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 21126903000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43475927040).

21126903000 is an abundant number, since it is smaller than the sum of its proper divisors (65824951080).

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

21126903000 is a wasteful number, since it uses less digits than its factorization.

21126903000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The spelling of 21126903000 in words is "twenty-one billion, one hundred twenty-six million, nine hundred three thousand".