21102011202111 has 24 divisors (see below), whose sum is σ = 32730266461104. Its totient is φ = 12058065008640.

The previous prime is 21102011202101. The next prime is 21102011202113. The reversal of 21102011202111 is 11120211020112.

It is a happy number.

It is not a de Polignac number, because 21102011202111 - 2¹⁹ = 21102010677823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102011202113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6639871 + ... + 9289343.

It is an arithmetic number, because the mean of its divisors is an integer number (1363761102546).

Almost surely, 2^{21102011202111} is an apocalyptic number.

21102011202111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21102011202111 is a deficient number, since it is larger than the sum of its proper divisors (11628255258993).

21102011202111 is a wasteful number, since it uses less digits than its factorization.

21102011202111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2703671 (or 2703664 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21102011202111 its reverse (11120211020112), we get a palindrome (32222222222223).

The spelling of 21102011202111 in words is "twenty-one trillion, one hundred two billion, eleven million, two hundred two thousand, one hundred eleven".