21040142102 has 32 divisors (see below), whose sum is σ = 36736761600. Its totient is φ = 8850689568.

The previous prime is 21040142041. The next prime is 21040142107. The reversal of 21040142102 is 20124104012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040142107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 525008 + ... + 563660.

It is an arithmetic number, because the mean of its divisors is an integer number (1148023800).

Almost surely, 2^21040142102 is an apocalyptic number.

21040142102 is a deficient number, since it is larger than the sum of its proper divisors (15696619498).

21040142102 is a wasteful number, since it uses less digits than its factorization.

21040142102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39380.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21040142102 its reverse (20124104012), we get a palindrome (41164246114).

The spelling of 21040142102 in words is "twenty-one billion, forty million, one hundred forty-two thousand, one hundred two".