21140405102 has 4 divisors (see below), whose sum is σ = 31710607656. Its totient is φ = 10570202550.

The previous prime is 21140405101. The next prime is 21140405179. The reversal of 21140405102 is 20150404112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140405101) 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 as a sum of consecutive naturals, namely, 5285101274 + ... + 5285101277.

It is an arithmetic number, because the mean of its divisors is an integer number (7927651914).

Almost surely, 2^21140405102 is an apocalyptic number.

21140405102 is a deficient number, since it is larger than the sum of its proper divisors (10570202554).

21140405102 is a wasteful number, since it uses less digits than its factorization.

21140405102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10570202553.

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 21140405102 its reverse (20150404112), we get a palindrome (41290809214).

The spelling of 21140405102 in words is "twenty-one billion, one hundred forty million, four hundred five thousand, one hundred two".