21503054435020 has 48 divisors (see below), whose sum is σ = 45817032131136. Its totient is φ = 8475520032000.

The previous prime is 21503054435003. The next prime is 21503054435081. The reversal of 21503054435020 is 2053445030512.

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, 1425891 + ... + 6711130.

It is an arithmetic number, because the mean of its divisors is an integer number (954521502732).

Almost surely, 2^{21503054435020} is an apocalyptic number.

21503054435020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21503054435020 is an abundant number, since it is smaller than the sum of its proper divisors (24313977696116).

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

21503054435020 is a wasteful number, since it uses less digits than its factorization.

21503054435020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8138962 (or 8138960 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

Adding to 21503054435020 its reverse (2053445030512), we get a palindrome (23556499465532).

The spelling of 21503054435020 in words is "twenty-one trillion, five hundred three billion, fifty-four million, four hundred thirty-five thousand, twenty".