21421044510123 has 8 divisors (see below), whose sum is σ = 28561801499136. Its totient is φ = 14280491930600.

The previous prime is 21421044510119. The next prime is 21421044510133. The reversal of 21421044510123 is 32101544012412.

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

It is a cyclic number.

It is not a de Polignac number, because 21421044510123 - 2² = 21421044510119 is a prime.

It is a super-2 number, since 2×21421044510123² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21421044510133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50857683 + ... + 51277148.

It is an arithmetic number, because the mean of its divisors is an integer number (3570225187392).

Almost surely, 2^{21421044510123} is an apocalyptic number.

21421044510123 is a deficient number, since it is larger than the sum of its proper divisors (7140756989013).

21421044510123 is a wasteful number, since it uses less digits than its factorization.

21421044510123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102204745.

The product of its (nonzero) digits is 7680, while the sum is 30.

Adding to 21421044510123 its reverse (32101544012412), we get a palindrome (53522588522535).

The spelling of 21421044510123 in words is "twenty-one trillion, four hundred twenty-one billion, forty-four million, five hundred ten thousand, one hundred twenty-three".