21140124121 has 8 divisors (see below), whose sum is σ = 22397865120. Its totient is φ = 19883961408.

The previous prime is 21140124107. The next prime is 21140124127. The reversal of 21140124121 is 12142104112.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21140124121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21140124127) 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 7 ways as a sum of consecutive naturals, for example, 366931 + ... + 420616.

It is an arithmetic number, because the mean of its divisors is an integer number (2799733140).

Almost surely, 2^21140124121 is an apocalyptic number.

It is an amenable number.

21140124121 is a deficient number, since it is larger than the sum of its proper divisors (1257740999).

21140124121 is a wasteful number, since it uses less digits than its factorization.

21140124121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789143.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21140124121 its reverse (12142104112), we get a palindrome (33282228233).

The spelling of 21140124121 in words is "twenty-one billion, one hundred forty million, one hundred twenty-four thousand, one hundred twenty-one".