21402214123 has 4 divisors (see below), whose sum is σ = 21405946528. Its totient is φ = 21398481720.

The previous prime is 21402214121. The next prime is 21402214139. The reversal of 21402214123 is 32141220412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21402214123 - 2¹ = 21402214121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21402214094 and 21402214103.

It is not an unprimeable number, because it can be changed into a prime (21402214121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1857588 + ... + 1869073.

It is an arithmetic number, because the mean of its divisors is an integer number (5351486632).

Almost surely, 2^21402214123 is an apocalyptic number.

21402214123 is a deficient number, since it is larger than the sum of its proper divisors (3732405).

21402214123 is an equidigital number, since it uses as much as digits as its factorization.

21402214123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3732404.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21402214123 its reverse (32141220412), we get a palindrome (53543434535).

The spelling of 21402214123 in words is "twenty-one billion, four hundred two million, two hundred fourteen thousand, one hundred twenty-three".