21113344234 has 4 divisors (see below), whose sum is σ = 31670016354. Its totient is φ = 10556672116.

The previous prime is 21113344181. The next prime is 21113344249. The reversal of 21113344234 is 43244331112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14160286009 + 6953058225 = 118997^2 + 83385^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5278336057 + ... + 5278336060.

Almost surely, 2^21113344234 is an apocalyptic number.

21113344234 is a deficient number, since it is larger than the sum of its proper divisors (10556672120).

21113344234 is a wasteful number, since it uses less digits than its factorization.

21113344234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10556672119.

The product of its digits is 6912, while the sum is 28.

Adding to 21113344234 its reverse (43244331112), we get a palindrome (64357675346).

The spelling of 21113344234 in words is "twenty-one billion, one hundred thirteen million, three hundred forty-four thousand, two hundred thirty-four".