21525120014 has 4 divisors (see below), whose sum is σ = 32287680024. Its totient is φ = 10762560006.

The previous prime is 21525120011. The next prime is 21525120053. The reversal of 21525120014 is 41002152512.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21525120011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5381280002 + ... + 5381280005.

It is an arithmetic number, because the mean of its divisors is an integer number (8071920006).

Almost surely, 2^21525120014 is an apocalyptic number.

21525120014 is a deficient number, since it is larger than the sum of its proper divisors (10762560010).

21525120014 is a wasteful number, since it uses less digits than its factorization.

21525120014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10762560009.

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 21525120014 its reverse (41002152512), we get a palindrome (62527272526).

The spelling of 21525120014 in words is "twenty-one billion, five hundred twenty-five million, one hundred twenty thousand, fourteen".