21404402410 has 8 divisors (see below), whose sum is σ = 38527924356. Its totient is φ = 8561760960.

The previous prime is 21404402401. The next prime is 21404402413. The reversal of 21404402410 is 1420440412.

It can be written as a sum of positive squares in 2 ways, for example, as 19069676649 + 2334725761 = 138093^2 + 48319^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21404402413) 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, 1070220111 + ... + 1070220130.

Almost surely, 2^21404402410 is an apocalyptic number.

21404402410 is a deficient number, since it is larger than the sum of its proper divisors (17123521946).

21404402410 is a wasteful number, since it uses less digits than its factorization.

21404402410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140440248.

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21404402410 its reverse (1420440412), we get a palindrome (22824842822).

The spelling of 21404402410 in words is "twenty-one billion, four hundred four million, four hundred two thousand, four hundred ten".