21402213421123 has 8 divisors (see below), whose sum is σ = 21593322233568. Its totient is φ = 21211134585984.

The previous prime is 21402213421097. The next prime is 21402213421139. The reversal of 21402213421123 is 32112431220412.

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 21402213421123 - 2⁵ = 21402213421091 is a prime.

It is a super-2 number, since 2×21402213421123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21402213421091 and 21402213421100.

It is not an unprimeable number, because it can be changed into a prime (21402213521123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6058836 + ... + 8917057.

It is an arithmetic number, because the mean of its divisors is an integer number (2699165279196).

Almost surely, 2^{21402213421123} is an apocalyptic number.

21402213421123 is a deficient number, since it is larger than the sum of its proper divisors (191108812445).

21402213421123 is a wasteful number, since it uses less digits than its factorization.

21402213421123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14988653.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21402213421123 its reverse (32112431220412), we get a palindrome (53514644641535).

The spelling of 21402213421123 in words is "twenty-one trillion, four hundred two billion, two hundred thirteen million, four hundred twenty-one thousand, one hundred twenty-three".