21103445000 has 320 divisors, whose sum is σ = 56783073600. Its totient is φ = 7280000000.

The previous prime is 21103444981. The next prime is 21103445017. The reversal of 21103445000 is 54430112.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 161094935 + ... + 161095065.

It is an arithmetic number, because the mean of its divisors is an integer number (177447105).

Almost surely, 2^21103445000 is an apocalyptic number.

21103445000 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 21103445000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28391536800).

21103445000 is an abundant number, since it is smaller than the sum of its proper divisors (35679628600).

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

21103445000 is a wasteful number, since it uses less digits than its factorization.

21103445000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21103445000 its reverse (54430112), we get a palindrome (21157875112).

The spelling of 21103445000 in words is "twenty-one billion, one hundred three million, four hundred forty-five thousand".