21001102111 has 8 divisors (see below), whose sum is σ = 22927837824. Its totient is φ = 19077290520.

The previous prime is 21001102091. The next prime is 21001102121. The reversal of 21001102111 is 11120110012.

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

It is a cyclic number.

It is not a de Polignac number, because 21001102111 - 2¹⁷ = 21000971039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001102121) 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 in 7 ways as a sum of consecutive naturals, for example, 715995 + ... + 744748.

It is an arithmetic number, because the mean of its divisors is an integer number (2865979728).

Almost surely, 2^21001102111 is an apocalyptic number.

21001102111 is a deficient number, since it is larger than the sum of its proper divisors (1926735713).

21001102111 is a wasteful number, since it uses less digits than its factorization.

21001102111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1462061.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21001102111 its reverse (11120110012), we get a palindrome (32121212123).

The spelling of 21001102111 in words is "twenty-one billion, one million, one hundred two thousand, one hundred eleven".