21402104234 has 8 divisors (see below), whose sum is σ = 36689321568. Its totient is φ = 9172330380.

The previous prime is 21402104221. The next prime is 21402104257. The reversal of 21402104234 is 43240120412.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 764360852 + ... + 764360879.

It is an arithmetic number, because the mean of its divisors is an integer number (4586165196).

Almost surely, 2^21402104234 is an apocalyptic number.

21402104234 is a deficient number, since it is larger than the sum of its proper divisors (15287217334).

21402104234 is a wasteful number, since it uses less digits than its factorization.

21402104234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528721740.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21402104234 its reverse (43240120412), we get a palindrome (64642224646).

The spelling of 21402104234 in words is "twenty-one billion, four hundred two million, one hundred four thousand, two hundred thirty-four".