21140433420 has 48 divisors (see below), whose sum is σ = 59523932160. Its totient is φ = 5605951936.

The previous prime is 21140433409. The next prime is 21140433443. The reversal of 21140433420 is 2433404112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 973452 + ... + 994931.

It is an arithmetic number, because the mean of its divisors is an integer number (1240081920).

Almost surely, 2^21140433420 is an apocalyptic number.

21140433420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21140433420 is an abundant number, since it is smaller than the sum of its proper divisors (38383498740).

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

21140433420 is a wasteful number, since it uses less digits than its factorization.

21140433420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968574 (or 1968572 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21140433420 its reverse (2433404112), we get a palindrome (23573837532).

The spelling of 21140433420 in words is "twenty-one billion, one hundred forty million, four hundred thirty-three thousand, four hundred twenty".