1000021100111 has 24 divisors (see below), whose sum is σ = 1110325332144. Its totient is φ = 899910000000.

The previous prime is 1000021100107. The next prime is 1000021100153. The reversal of 1000021100111 is 1110011200001.

It is a happy number.

It is not a de Polignac number, because 1000021100111 - 2² = 1000021100107 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 (1000021100171) 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, 109996676 + ... + 110005766.

It is an arithmetic number, because the mean of its divisors is an integer number (46263555506).

Almost surely, 2^{1000021100111} is an apocalyptic number.

1000021100111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1000021100111 is a deficient number, since it is larger than the sum of its proper divisors (110304232033).

1000021100111 is a wasteful number, since it uses less digits than its factorization.

1000021100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18215 (or 18204 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 1000021100111 its reverse (1110011200001), we get a palindrome (2110032300112).

The spelling of 1000021100111 in words is "one trillion, twenty-one million, one hundred thousand, one hundred eleven".