21140332442 has 4 divisors (see below), whose sum is σ = 31710498666. Its totient is φ = 10570166220.

The previous prime is 21140332363. The next prime is 21140332453. The reversal of 21140332442 is 24423304112.

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., 18012055681 + 3128276761 = 134209^2 + 55931^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5285083109 + ... + 5285083112.

Almost surely, 2^21140332442 is an apocalyptic number.

21140332442 is a deficient number, since it is larger than the sum of its proper divisors (10570166224).

21140332442 is a wasteful number, since it uses less digits than its factorization.

21140332442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10570166223.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21140332442 its reverse (24423304112), we get a palindrome (45563636554).

The spelling of 21140332442 in words is "twenty-one billion, one hundred forty million, three hundred thirty-two thousand, four hundred forty-two".