21242231030420 has 24 divisors (see below), whose sum is σ = 44621283077448. Its totient is φ = 8494492809600.

The previous prime is 21242231030417. The next prime is 21242231030479. The reversal of 21242231030420 is 2403013224212.

It can be written as a sum of positive squares in 4 ways, for example, as 303059058064 + 20939171972356 = 550508^2 + 4575934^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21242231030420.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149902571 + ... + 150044210.

It is an arithmetic number, because the mean of its divisors is an integer number (1859220128227).

Almost surely, 2^{21242231030420} is an apocalyptic number.

21242231030420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21242231030420 is an abundant number, since it is smaller than the sum of its proper divisors (23379052047028).

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

21242231030420 is a wasteful number, since it uses less digits than its factorization.

21242231030420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299950331 (or 299950329 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21242231030420 its reverse (2403013224212), we get a palindrome (23645244254632).

The spelling of 21242231030420 in words is "twenty-one trillion, two hundred forty-two billion, two hundred thirty-one million, thirty thousand, four hundred twenty".