21411404121 has 16 divisors (see below), whose sum is σ = 29110000320. Its totient is φ = 13993961280.

The previous prime is 21411404117. The next prime is 21411404197. The reversal of 21411404121 is 12140411412.

It is not a de Polignac number, because 21411404121 - 2² = 21411404117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21411404101) 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, 153115 + ... + 257423.

It is an arithmetic number, because the mean of its divisors is an integer number (1819375020).

Almost surely, 2^21411404121 is an apocalyptic number.

It is an amenable number.

21411404121 is a deficient number, since it is larger than the sum of its proper divisors (7698596199).

21411404121 is a wasteful number, since it uses less digits than its factorization.

21411404121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105656.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21411404121 its reverse (12140411412), we get a palindrome (33551815533).

The spelling of 21411404121 in words is "twenty-one billion, four hundred eleven million, four hundred four thousand, one hundred twenty-one".