100021200111 has 72 divisors (see below), whose sum is σ = 173836790400. Its totient is φ = 56297614032.

The previous prime is 100021200079. The next prime is 100021200151. The reversal of 100021200111 is 111002120001.

It is a happy number.

It is not a de Polignac number, because 100021200111 - 2⁵ = 100021200079 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 100021200093 and 100021200102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100021200151) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7629240 + ... + 7642338.

Almost surely, 2^100021200111 is an apocalyptic number.

100021200111 is a deficient number, since it is larger than the sum of its proper divisors (73815590289).

100021200111 is an frugal number, since it uses more digits than its factorization.

100021200111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13255 (or 13176 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 100021200111 its reverse (111002120001), we get a palindrome (211023320112).

The spelling of 100021200111 in words is "one hundred billion, twenty-one million, two hundred thousand, one hundred eleven".