21422020340 has 96 divisors (see below), whose sum is σ = 52182434304. Its totient is φ = 7235504640.

The previous prime is 21422020261. The next prime is 21422020343. The reversal of 21422020340 is 4302022412.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422020343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2836970 + ... + 2844510.

It is an arithmetic number, because the mean of its divisors is an integer number (543567024).

Almost surely, 2^21422020340 is an apocalyptic number.

21422020340 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 21422020340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26091217152).

21422020340 is an abundant number, since it is smaller than the sum of its proper divisors (30760413964).

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

21422020340 is a wasteful number, since it uses less digits than its factorization.

21422020340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7857 (or 7855 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21422020340 its reverse (4302022412), we get a palindrome (25724042752).

The spelling of 21422020340 in words is "twenty-one billion, four hundred twenty-two million, twenty thousand, three hundred forty".