21433142420 has 24 divisors (see below), whose sum is σ = 45019659048. Its totient is φ = 8571340800.

The previous prime is 21433142399. The next prime is 21433142461. The reversal of 21433142420 is 2424133412.

It can be written as a sum of positive squares in 4 ways, for example, as 5037876484 + 16395265936 = 70978^2 + 128044^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21433142420.

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, 26261 + ... + 208700.

It is an arithmetic number, because the mean of its divisors is an integer number (1875819127).

Almost surely, 2^21433142420 is an apocalyptic number.

21433142420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21433142420 is an abundant number, since it is smaller than the sum of its proper divisors (23586516628).

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

21433142420 is a wasteful number, since it uses less digits than its factorization.

21433142420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239531 (or 239529 counting only the distinct ones).

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

Adding to 21433142420 its reverse (2424133412), we get a palindrome (23857275832).

The spelling of 21433142420 in words is "twenty-one billion, four hundred thirty-three million, one hundred forty-two thousand, four hundred twenty".