21541004252 has 6 divisors (see below), whose sum is σ = 37696757448. Its totient is φ = 10770502124.

The previous prime is 21541004239. The next prime is 21541004267. The reversal of 21541004252 is 25240014512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2692625528 + ... + 2692625535.

It is an arithmetic number, because the mean of its divisors is an integer number (6282792908).

Almost surely, 2^21541004252 is an apocalyptic number.

It is an amenable number.

21541004252 is a deficient number, since it is larger than the sum of its proper divisors (16155753196).

21541004252 is a wasteful number, since it uses less digits than its factorization.

21541004252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5385251067 (or 5385251065 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 21541004252 its reverse (25240014512), we get a palindrome (46781018764).

The spelling of 21541004252 in words is "twenty-one billion, five hundred forty-one million, four thousand, two hundred fifty-two".