21411400429 has 4 divisors (see below), whose sum is σ = 21412238076. Its totient is φ = 21410562784.

The previous prime is 21411400421. The next prime is 21411400441. The reversal of 21411400429 is 92400411412.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9178598025 + 12232802404 = 95805^2 + 110602^2 .

It is a cyclic number.

It is not a de Polignac number, because 21411400429 - 2³ = 21411400421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21411400397 and 21411400406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21411400421) 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, 379234 + ... + 432019.

It is an arithmetic number, because the mean of its divisors is an integer number (5353059519).

Almost surely, 2^21411400429 is an apocalyptic number.

It is an amenable number.

21411400429 is a deficient number, since it is larger than the sum of its proper divisors (837647).

21411400429 is an equidigital number, since it uses as much as digits as its factorization.

21411400429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837646.

The product of its (nonzero) digits is 2304, while the sum is 28.

The spelling of 21411400429 in words is "twenty-one billion, four hundred eleven million, four hundred thousand, four hundred twenty-nine".