21400342241 has 8 divisors (see below), whose sum is σ = 21714971904. Its totient is φ = 21086079840.

The previous prime is 21400342213. The next prime is 21400342289. The reversal of 21400342241 is 14224300412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21400342241 - 2⁶ = 21400342177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21400342541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26696 + ... + 208598.

It is an arithmetic number, because the mean of its divisors is an integer number (2714371488).

Almost surely, 2^21400342241 is an apocalyptic number.

It is an amenable number.

21400342241 is a deficient number, since it is larger than the sum of its proper divisors (314629663).

21400342241 is a wasteful number, since it uses less digits than its factorization.

21400342241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183631.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21400342241 its reverse (14224300412), we get a palindrome (35624642653).

The spelling of 21400342241 in words is "twenty-one billion, four hundred million, three hundred forty-two thousand, two hundred forty-one".