21404421241 has 16 divisors (see below), whose sum is σ = 24806721024. Its totient is φ = 18089938944.

The previous prime is 21404421223. The next prime is 21404421271. The reversal of 21404421241 is 14212440412.

It is a happy number.

It is not a de Polignac number, because 21404421241 - 2²³ = 21396032633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21404421221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82560 + ... + 222766.

It is an arithmetic number, because the mean of its divisors is an integer number (1550420064).

Almost surely, 2^21404421241 is an apocalyptic number.

It is an amenable number.

21404421241 is a deficient number, since it is larger than the sum of its proper divisors (3402299783).

21404421241 is a wasteful number, since it uses less digits than its factorization.

21404421241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140520.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 21404421241 its reverse (14212440412), we get a palindrome (35616861653).

The spelling of 21404421241 in words is "twenty-one billion, four hundred four million, four hundred twenty-one thousand, two hundred forty-one".