21300422040 has 128 divisors (see below), whose sum is σ = 71124480000. Its totient is φ = 5670267264.

The previous prime is 21300422027. The next prime is 21300422063. The reversal of 21300422040 is 4022400312.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 617161 + ... + 650759.

It is an arithmetic number, because the mean of its divisors is an integer number (555660000).

Almost surely, 2^21300422040 is an apocalyptic number.

21300422040 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 21300422040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35562240000).

21300422040 is an abundant number, since it is smaller than the sum of its proper divisors (49824057960).

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

21300422040 is a wasteful number, since it uses less digits than its factorization.

21300422040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34206 (or 34196 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21300422040 its reverse (4022400312), we get a palindrome (25322822352).

The spelling of 21300422040 in words is "twenty-one billion, three hundred million, four hundred twenty-two thousand, forty".