21002113342 has 24 divisors (see below), whose sum is σ = 36830732400. Its totient is φ = 8955666720.

The previous prime is 21002113291. The next prime is 21002113343. The reversal of 21002113342 is 24331120012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002113343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 518959 + ... + 557962.

It is an arithmetic number, because the mean of its divisors is an integer number (1534613850).

Almost surely, 2^21002113342 is an apocalyptic number.

21002113342 is a deficient number, since it is larger than the sum of its proper divisors (15828619058).

21002113342 is a wasteful number, since it uses less digits than its factorization.

21002113342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077136 (or 1077129 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21002113342 its reverse (24331120012), we get a palindrome (45333233354).

The spelling of 21002113342 in words is "twenty-one billion, two million, one hundred thirteen thousand, three hundred forty-two".