21011111102 has 8 divisors (see below), whose sum is σ = 31517299800. Its totient is φ = 10505344504.

The previous prime is 21011111101. The next prime is 21011111119. The reversal of 21011111102 is 20111111012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011111101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95549 + ... + 226167.

It is an arithmetic number, because the mean of its divisors is an integer number (3939662475).

Almost surely, 2^21011111102 is an apocalyptic number.

21011111102 is a deficient number, since it is larger than the sum of its proper divisors (10506188698).

21011111102 is a wasteful number, since it uses less digits than its factorization.

21011111102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211050.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21011111102 its reverse (20111111012), we get a palindrome (41122222114).

The spelling of 21011111102 in words is "twenty-one billion, eleven million, one hundred eleven thousand, one hundred two".