21353273525 has 24 divisors (see below), whose sum is σ = 27740200704. Its totient is φ = 16284787200.

The previous prime is 21353273507. The next prime is 21353273527. The reversal of 21353273525 is 52537235312.

It is a de Polignac number, because none of the positive numbers 2^k-21353273525 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21353273527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 153692 + ... + 257541.

It is an arithmetic number, because the mean of its divisors is an integer number (1155841696).

Almost surely, 2^21353273525 is an apocalyptic number.

21353273525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21353273525 is a deficient number, since it is larger than the sum of its proper divisors (6386927179).

21353273525 is a wasteful number, since it uses less digits than its factorization.

21353273525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411341 (or 411336 counting only the distinct ones).

The product of its digits is 189000, while the sum is 38.

The spelling of 21353273525 in words is "twenty-one billion, three hundred fifty-three million, two hundred seventy-three thousand, five hundred twenty-five".