21342461121 has 16 divisors (see below), whose sum is σ = 31620715200. Its totient is φ = 14227293024.

The previous prime is 21342461089. The next prime is 21342461123. The reversal of 21342461121 is 12116424312.

21342461121 is a `hidden beast` number, since 2 + 1 + 3 + 4 + 24 + 611 + 21 = 666.

It is not a de Polignac number, because 21342461121 - 2⁵ = 21342461089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21342461123) 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, 694990 + ... + 725048.

It is an arithmetic number, because the mean of its divisors is an integer number (1976294700).

Almost surely, 2^21342461121 is an apocalyptic number.

It is an amenable number.

21342461121 is a deficient number, since it is larger than the sum of its proper divisors (10278254079).

21342461121 is a wasteful number, since it uses less digits than its factorization.

21342461121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56365 (or 56359 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

Adding to 21342461121 its reverse (12116424312), we get a palindrome (33458885433).

The spelling of 21342461121 in words is "twenty-one billion, three hundred forty-two million, four hundred sixty-one thousand, one hundred twenty-one".