21400052241 has 16 divisors (see below), whose sum is σ = 30099513600. Its totient is φ = 13486863888.

The previous prime is 21400052239. The next prime is 21400052243. The reversal of 21400052241 is 14225000412.

It is an interprime number because it is at equal distance from previous prime (21400052239) and next prime (21400052243).

It is not a de Polignac number, because 21400052241 - 2¹ = 21400052239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21400052243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 375351 + ... + 428588.

It is an arithmetic number, because the mean of its divisors is an integer number (1881219600).

Almost surely, 2^21400052241 is an apocalyptic number.

It is an amenable number.

21400052241 is a deficient number, since it is larger than the sum of its proper divisors (8699461359).

21400052241 is a wasteful number, since it uses less digits than its factorization.

21400052241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804428.

The product of its (nonzero) digits is 640, while the sum is 21.

Adding to 21400052241 its reverse (14225000412), we get a palindrome (35625052653).

The spelling of 21400052241 in words is "twenty-one billion, four hundred million, fifty-two thousand, two hundred forty-one".