21404430274 has 8 divisors (see below), whose sum is σ = 32108062140. Its totient is φ = 10701742896.

The previous prime is 21404430233. The next prime is 21404430277. The reversal of 21404430274 is 47203440412.

It can be written as a sum of positive squares in 2 ways, for example, as 20738016049 + 666414225 = 144007^2 + 25815^2 .

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 (21404430277) 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, 176449 + ... + 271924.

Almost surely, 2^21404430274 is an apocalyptic number.

21404430274 is a deficient number, since it is larger than the sum of its proper divisors (10703631866).

21404430274 is a wasteful number, since it uses less digits than its factorization.

21404430274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472244.

The product of its (nonzero) digits is 21504, while the sum is 31.

Adding to 21404430274 its reverse (47203440412), we get a palindrome (68607870686).

The spelling of 21404430274 in words is "twenty-one billion, four hundred four million, four hundred thirty thousand, two hundred seventy-four".