21310342235 has 16 divisors (see below), whose sum is σ = 31473736896. Its totient is φ = 13488743808.

The previous prime is 21310342217. The next prime is 21310342241. The reversal of 21310342235 is 53224301312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21310342235 - 2¹² = 21310338139 is a prime.

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, 23417504 + ... + 23418413.

It is an arithmetic number, because the mean of its divisors is an integer number (1967108556).

Almost surely, 2^21310342235 is an apocalyptic number.

21310342235 is a deficient number, since it is larger than the sum of its proper divisors (10163394661).

21310342235 is a wasteful number, since it uses less digits than its factorization.

21310342235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46835942.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21310342235 its reverse (53224301312), we get a palindrome (74534643547).

The spelling of 21310342235 in words is "twenty-one billion, three hundred ten million, three hundred forty-two thousand, two hundred thirty-five".