21211102102 has 4 divisors (see below), whose sum is σ = 31816653156. Its totient is φ = 10605551050.

The previous prime is 21211102091. The next prime is 21211102127. The reversal of 21211102102 is 20120111212.

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

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 as a sum of consecutive naturals, namely, 5302775524 + ... + 5302775527.

It is an arithmetic number, because the mean of its divisors is an integer number (7954163289).

Almost surely, 2^21211102102 is an apocalyptic number.

21211102102 is a deficient number, since it is larger than the sum of its proper divisors (10605551054).

21211102102 is a wasteful number, since it uses less digits than its factorization.

21211102102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10605551053.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21211102102 its reverse (20120111212), we get a palindrome (41331213314).

It can be divided in two parts, 2121110 and 2102, that added together give a palindrome (2123212).

The spelling of 21211102102 in words is "twenty-one billion, two hundred eleven million, one hundred two thousand, one hundred two".