21140401241 has 4 divisors (see below), whose sum is σ = 21141463092. Its totient is φ = 21139339392.

The previous prime is 21140401231. The next prime is 21140401253. The reversal of 21140401241 is 14210404112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7772185600 + 13368215641 = 88160^2 + 115621^2 .

It is a cyclic number.

It is not a de Polignac number, because 21140401241 - 2¹⁴ = 21140384857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21140401211) 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, 500480 + ... + 541073.

It is an arithmetic number, because the mean of its divisors is an integer number (5285365773).

Almost surely, 2^21140401241 is an apocalyptic number.

It is an amenable number.

21140401241 is a deficient number, since it is larger than the sum of its proper divisors (1061851).

21140401241 is a wasteful number, since it uses less digits than its factorization.

21140401241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061850.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21140401241 its reverse (14210404112), we get a palindrome (35350805353).

The spelling of 21140401241 in words is "twenty-one billion, one hundred forty million, four hundred one thousand, two hundred forty-one".