21242455041 has 4 divisors (see below), whose sum is σ = 28323273392. Its totient is φ = 14161636692.

The previous prime is 21242455001. The next prime is 21242455051. The reversal of 21242455041 is 14055424212.

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 21242455041 - 2¹⁵ = 21242422273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21242455001) 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, 3540409171 + ... + 3540409176.

It is an arithmetic number, because the mean of its divisors is an integer number (7080818348).

Almost surely, 2^21242455041 is an apocalyptic number.

It is an amenable number.

21242455041 is a deficient number, since it is larger than the sum of its proper divisors (7080818351).

21242455041 is an equidigital number, since it uses as much as digits as its factorization.

21242455041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7080818350.

The product of its (nonzero) digits is 12800, while the sum is 30.

Adding to 21242455041 its reverse (14055424212), we get a palindrome (35297879253).

The spelling of 21242455041 in words is "twenty-one billion, two hundred forty-two million, four hundred fifty-five thousand, forty-one".