21524120403 has 16 divisors (see below), whose sum is σ = 29045761536. Its totient is φ = 14176562400.

The previous prime is 21524120399. The next prime is 21524120437. The reversal of 21524120403 is 30402142512.

It is not a de Polignac number, because 21524120403 - 2² = 21524120399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21524120473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63576 + ... + 217002.

It is an arithmetic number, because the mean of its divisors is an integer number (1815360096).

Almost surely, 2^21524120403 is an apocalyptic number.

21524120403 is a deficient number, since it is larger than the sum of its proper divisors (7521641133).

21524120403 is a wasteful number, since it uses less digits than its factorization.

21524120403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153994.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21524120403 its reverse (30402142512), we get a palindrome (51926262915).

The spelling of 21524120403 in words is "twenty-one billion, five hundred twenty-four million, one hundred twenty thousand, four hundred three".