21503055504425 has 24 divisors (see below), whose sum is σ = 29089466294880. Its totient is φ = 15637673635200.

The previous prime is 21503055504409. The next prime is 21503055504461. The reversal of 21503055504425 is 52440555030512.

It is not a de Polignac number, because 21503055504425 - 2⁴ = 21503055504409 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2460614 + ... + 7004336.

It is an arithmetic number, because the mean of its divisors is an integer number (1212061095620).

Almost surely, 2^{21503055504425} is an apocalyptic number.

21503055504425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21503055504425 is a deficient number, since it is larger than the sum of its proper divisors (7586410790455).

21503055504425 is a wasteful number, since it uses less digits than its factorization.

21503055504425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4560953 (or 4560948 counting only the distinct ones).

The product of its (nonzero) digits is 600000, while the sum is 41.

The spelling of 21503055504425 in words is "twenty-one trillion, five hundred three billion, fifty-five million, five hundred four thousand, four hundred twenty-five".