21353005025 has 24 divisors (see below), whose sum is σ = 28963634304. Its totient is φ = 15487070400.

The previous prime is 21353005021. The next prime is 21353005027. The reversal of 21353005025 is 52050035312.

It is not a de Polignac number, because 21353005025 - 2² = 21353005021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21353004985 and 21353005003.

It is not an unprimeable number, because it can be changed into a prime (21353005021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4862 + ... + 206711.

It is an arithmetic number, because the mean of its divisors is an integer number (1206818096).

Almost surely, 2^21353005025 is an apocalyptic number.

21353005025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21353005025 is a deficient number, since it is larger than the sum of its proper divisors (7610629279).

21353005025 is a wasteful number, since it uses less digits than its factorization.

21353005025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211961 (or 211956 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 26.

The spelling of 21353005025 in words is "twenty-one billion, three hundred fifty-three million, five thousand, twenty-five".