21022244142420 has 96 divisors (see below), whose sum is σ = 60763740871680. Its totient is φ = 5424856519680.

The previous prime is 21022244142349. The next prime is 21022244142433. The reversal of 21022244142420 is 2424144222012.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 44159584 + ... + 44633096.

It is an arithmetic number, because the mean of its divisors is an integer number (632955634080).

Almost surely, 2^{21022244142420} is an apocalyptic number.

21022244142420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022244142420 is an abundant number, since it is smaller than the sum of its proper divisors (39741496729260).

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

21022244142420 is a wasteful number, since it uses less digits than its factorization.

21022244142420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497425 (or 497423 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 30.

Adding to 21022244142420 its reverse (2424144222012), we get a palindrome (23446388364432).

The spelling of 21022244142420 in words is "twenty-one trillion, twenty-two billion, two hundred forty-four million, one hundred forty-two thousand, four hundred twenty".