100221511 has 16 divisors (see below), whose sum is σ = 119254464. Its totient is φ = 83280384.

The previous prime is 100221509. The next prime is 100221521. The reversal of 100221511 is 115122001.

It is a cyclic number.

It is not a de Polignac number, because 100221511 - 2¹ = 100221509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100221491 and 100221500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100221521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4776 + ... + 14941.

It is an arithmetic number, because the mean of its divisors is an integer number (7453404).

Almost surely, 2^100221511 is an apocalyptic number.

100221511 is a deficient number, since it is larger than the sum of its proper divisors (19032953).

100221511 is a wasteful number, since it uses less digits than its factorization.

100221511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19770.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 100221511 is about 10011.0694233933. The cubic root of 100221511 is about 464.5013516120.

Adding to 100221511 its reverse (115122001), we get a palindrome (215343512).

The spelling of 100221511 in words is "one hundred million, two hundred twenty-one thousand, five hundred eleven".