21111023102 has 8 divisors (see below), whose sum is σ = 34102421976. Its totient is φ = 9743549112.

The previous prime is 21111023051. The next prime is 21111023117. The reversal of 21111023102 is 20132011112.

It is a sphenic number, since it is the product of 3 distinct 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 in 3 ways as a sum of consecutive naturals, for example, 405981188 + ... + 405981239.

It is an arithmetic number, because the mean of its divisors is an integer number (4262802747).

Almost surely, 2^21111023102 is an apocalyptic number.

21111023102 is a deficient number, since it is larger than the sum of its proper divisors (12991398874).

21111023102 is a wasteful number, since it uses less digits than its factorization.

21111023102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811962442.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21111023102 its reverse (20132011112), we get a palindrome (41243034214).

The spelling of 21111023102 in words is "twenty-one billion, one hundred eleven million, twenty-three thousand, one hundred two".