100021111221 has 8 divisors (see below), whose sum is σ = 133367580640. Its totient is φ = 66677691312.

The previous prime is 100021111193. The next prime is 100021111231. The reversal of 100021111221 is 122111120001.

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

It is not a de Polignac number, because 100021111221 - 2¹¹ = 100021109173 is a prime.

It is a super-2 number, since 2×100021111221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100021111197 and 100021111206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100021111231) 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, 684715 + ... + 817848.

It is an arithmetic number, because the mean of its divisors is an integer number (16670947580).

Almost surely, 2^100021111221 is an apocalyptic number.

It is an amenable number.

100021111221 is a deficient number, since it is larger than the sum of its proper divisors (33346469419).

100021111221 is a wasteful number, since it uses less digits than its factorization.

100021111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524755.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 100021111221 its reverse (122111120001), we get a palindrome (222132231222).

The spelling of 100021111221 in words is "one hundred billion, twenty-one million, one hundred eleven thousand, two hundred twenty-one".