21310042242 has 32 divisors (see below), whose sum is σ = 43049410560. Its totient is φ = 7031843280.

The previous prime is 21310042183. The next prime is 21310042267. The reversal of 21310042242 is 24224001312.

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, 2566117 + ... + 2574407.

It is an arithmetic number, because the mean of its divisors is an integer number (1345294080).

Almost surely, 2^21310042242 is an apocalyptic number.

21310042242 is an abundant number, since it is smaller than the sum of its proper divisors (21739368318).

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

21310042242 is a wasteful number, since it uses less digits than its factorization.

21310042242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12558.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21310042242 its reverse (24224001312), we get a palindrome (45534043554).

The spelling of 21310042242 in words is "twenty-one billion, three hundred ten million, forty-two thousand, two hundred forty-two".