21151040241 has 4 divisors (see below), whose sum is σ = 28201386992. Its totient is φ = 14100693492.

The previous prime is 21151040237. The next prime is 21151040257. The reversal of 21151040241 is 14204015112.

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 not a de Polignac number, because 21151040241 - 2² = 21151040237 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21151040201) 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, 3525173371 + ... + 3525173376.

It is an arithmetic number, because the mean of its divisors is an integer number (7050346748).

Almost surely, 2^21151040241 is an apocalyptic number.

It is an amenable number.

21151040241 is a deficient number, since it is larger than the sum of its proper divisors (7050346751).

21151040241 is an equidigital number, since it uses as much as digits as its factorization.

21151040241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7050346750.

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 21151040241 its reverse (14204015112), we get a palindrome (35355055353).

The spelling of 21151040241 in words is "twenty-one billion, one hundred fifty-one million, forty thousand, two hundred forty-one".