21014400423 has 8 divisors (see below), whose sum is σ = 28122593536. Its totient is φ = 13957903800.

The previous prime is 21014400419. The next prime is 21014400437. The reversal of 21014400423 is 32400441012.

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

It is not a de Polignac number, because 21014400423 - 2² = 21014400419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21014400423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21014400403) 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, 12923173 + ... + 12924798.

It is an arithmetic number, because the mean of its divisors is an integer number (3515324192).

Almost surely, 2^21014400423 is an apocalyptic number.

21014400423 is a deficient number, since it is larger than the sum of its proper divisors (7108193113).

21014400423 is a wasteful number, since it uses less digits than its factorization.

21014400423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25848245.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21014400423 its reverse (32400441012), we get a palindrome (53414841435).

The spelling of 21014400423 in words is "twenty-one billion, fourteen million, four hundred thousand, four hundred twenty-three".