21113130442 has 4 divisors (see below), whose sum is σ = 31669695666. Its totient is φ = 10556565220.

The previous prime is 21113130431. The next prime is 21113130469. The reversal of 21113130442 is 24403131112.

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., 15704851761 + 5408278681 = 125319^2 + 73541^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5278282609 + ... + 5278282612.

Almost surely, 2^21113130442 is an apocalyptic number.

21113130442 is a deficient number, since it is larger than the sum of its proper divisors (10556565224).

21113130442 is a wasteful number, since it uses less digits than its factorization.

21113130442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10556565223.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21113130442 its reverse (24403131112), we get a palindrome (45516261554).

The spelling of 21113130442 in words is "twenty-one billion, one hundred thirteen million, one hundred thirty thousand, four hundred forty-two".