21404422123 has 8 divisors (see below), whose sum is σ = 24463233248. Its totient is φ = 18345870144.

The previous prime is 21404422121. The next prime is 21404422141. The reversal of 21404422123 is 32122440412.

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

It is not a de Polignac number, because 21404422123 - 2¹ = 21404422121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21404422121) 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, 167965 + ... + 266497.

It is an arithmetic number, because the mean of its divisors is an integer number (3057904156).

Almost surely, 2^21404422123 is an apocalyptic number.

21404422123 is a deficient number, since it is larger than the sum of its proper divisors (3058811125).

21404422123 is an equidigital number, since it uses as much as digits as its factorization.

21404422123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129573.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21404422123 its reverse (32122440412), we get a palindrome (53526862535).

The spelling of 21404422123 in words is "twenty-one billion, four hundred four million, four hundred twenty-two thousand, one hundred twenty-three".