21404402334 has 64 divisors (see below), whose sum is σ = 54751603200. Its totient is φ = 6071531904.

The previous prime is 21404402317. The next prime is 21404402353. The reversal of 21404402334 is 43320440412.

It is a happy number.

21404402334 is a `hidden beast` number, since 21 + 404 + 4 + 0 + 233 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21404402298 and 21404402307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 151147 + ... + 256230.

It is an arithmetic number, because the mean of its divisors is an integer number (855493800).

Almost surely, 2^21404402334 is an apocalyptic number.

21404402334 is an abundant number, since it is smaller than the sum of its proper divisors (33347200866).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21404402334 is a wasteful number, since it uses less digits than its factorization.

21404402334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407534 (or 407528 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 21404402334 its reverse (43320440412), we get a palindrome (64724842746).

The spelling of 21404402334 in words is "twenty-one billion, four hundred four million, four hundred two thousand, three hundred thirty-four".