21402310434 has 32 divisors (see below), whose sum is σ = 43879921344. Its totient is φ = 6956539200.

The previous prime is 21402310417. The next prime is 21402310453. The reversal of 21402310434 is 43401320412.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154617 + ... + 258284.

It is an arithmetic number, because the mean of its divisors is an integer number (1371247542).

Almost surely, 2^21402310434 is an apocalyptic number.

21402310434 is an abundant number, since it is smaller than the sum of its proper divisors (22477610910).

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

21402310434 is a wasteful number, since it uses less digits than its factorization.

21402310434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413122.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21402310434 its reverse (43401320412), we get a palindrome (64803630846).

The spelling of 21402310434 in words is "twenty-one billion, four hundred two million, three hundred ten thousand, four hundred thirty-four".