21034242525 has 24 divisors (see below), whose sum is σ = 35516548224. Its totient is φ = 10979574400.

The previous prime is 21034242499. The next prime is 21034242563. The reversal of 21034242525 is 52524243012.

It is not a de Polignac number, because 21034242525 - 2²¹ = 21032145373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21034242492 and 21034242501.

It is a congruent number.

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, 2980056 + ... + 2987105.

It is an arithmetic number, because the mean of its divisors is an integer number (1479856176).

Almost surely, 2^21034242525 is an apocalyptic number.

21034242525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21034242525 is a deficient number, since it is larger than the sum of its proper divisors (14482305699).

21034242525 is a wasteful number, since it uses less digits than its factorization.

21034242525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5967221 (or 5967216 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 21034242525 its reverse (52524243012), we get a palindrome (73558485537).

The spelling of 21034242525 in words is "twenty-one billion, thirty-four million, two hundred forty-two thousand, five hundred twenty-five".