21002111342 has 8 divisors (see below), whose sum is σ = 32235798936. Its totient is φ = 10256845032.

The previous prime is 21002111329. The next prime is 21002111357. The reversal of 21002111342 is 24311120012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21002111342.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 122105213 + ... + 122105384.

It is an arithmetic number, because the mean of its divisors is an integer number (4029474867).

Almost surely, 2^21002111342 is an apocalyptic number.

21002111342 is a deficient number, since it is larger than the sum of its proper divisors (11233687594).

21002111342 is a wasteful number, since it uses less digits than its factorization.

21002111342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244210642.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21002111342 its reverse (24311120012), we get a palindrome (45313231354).

The spelling of 21002111342 in words is "twenty-one billion, two million, one hundred eleven thousand, three hundred forty-two".