21303142420 has 24 divisors (see below), whose sum is σ = 51127542144. Its totient is φ = 7303934496.

The previous prime is 21303142417. The next prime is 21303142477. The reversal of 21303142420 is 2424130312.

It is a junction number, because it is equal to n+sod(n) for n = 21303142391 and 21303142400.

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, 76082512 + ... + 76082791.

It is an arithmetic number, because the mean of its divisors is an integer number (2130314256).

Almost surely, 2^21303142420 is an apocalyptic number.

21303142420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21303142420 is an abundant number, since it is smaller than the sum of its proper divisors (29824399724).

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

21303142420 is a wasteful number, since it uses less digits than its factorization.

21303142420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152165319 (or 152165317 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21303142420 its reverse (2424130312), we get a palindrome (23727272732).

The spelling of 21303142420 in words is "twenty-one billion, three hundred three million, one hundred forty-two thousand, four hundred twenty".