21524012141 has 4 divisors (see below), whose sum is σ = 21555526752. Its totient is φ = 21492497532.

The previous prime is 21524012123. The next prime is 21524012149. The reversal of 21524012141 is 14121042512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21524012141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21524012149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15756281 + ... + 15757646.

It is an arithmetic number, because the mean of its divisors is an integer number (5388881688).

Almost surely, 2^21524012141 is an apocalyptic number.

It is an amenable number.

21524012141 is a deficient number, since it is larger than the sum of its proper divisors (31514611).

21524012141 is an equidigital number, since it uses as much as digits as its factorization.

21524012141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31514610.

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 21524012141 its reverse (14121042512), we get a palindrome (35645054653).

The spelling of 21524012141 in words is "twenty-one billion, five hundred twenty-four million, twelve thousand, one hundred forty-one".