21421322241 has 12 divisors (see below), whose sum is σ = 31394335056. Its totient is φ = 12982619320.

The previous prime is 21421322231. The next prime is 21421322249. The reversal of 21421322241 is 14222312412.

It is not a de Polignac number, because 21421322241 - 2⁹ = 21421321729 is a prime.

It is a super-2 number, since 2×21421322241² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21421322249) 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 11 ways as a sum of consecutive naturals, for example, 29505591 + ... + 29506316.

It is an arithmetic number, because the mean of its divisors is an integer number (2616194588).

Almost surely, 2^21421322241 is an apocalyptic number.

It is an amenable number.

21421322241 is a deficient number, since it is larger than the sum of its proper divisors (9973012815).

21421322241 is a wasteful number, since it uses less digits than its factorization.

21421322241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59011932 (or 59011921 counting only the distinct ones).

The product of its digits is 1536, while the sum is 24.

Adding to 21421322241 its reverse (14222312412), we get a palindrome (35643634653).

The spelling of 21421322241 in words is "twenty-one billion, four hundred twenty-one million, three hundred twenty-two thousand, two hundred forty-one".