100221331331 has 4 divisors (see below), whose sum is σ = 109332361464. Its totient is φ = 91110301200.

The previous prime is 100221331303. The next prime is 100221331351. The reversal of 100221331331 is 133133122001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100221331331 is a prime.

It is a super-2 number, since 2×100221331331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100221331351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4555515050 + ... + 4555515071.

It is an arithmetic number, because the mean of its divisors is an integer number (27333090366).

Almost surely, 2^100221331331 is an apocalyptic number.

100221331331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

100221331331 is a deficient number, since it is larger than the sum of its proper divisors (9111030133).

100221331331 is an equidigital number, since it uses as much as digits as its factorization.

100221331331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9111030132.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 100221331331 its reverse (133133122001), we get a palindrome (233354453332).

The spelling of 100221331331 in words is "one hundred billion, two hundred twenty-one million, three hundred thirty-one thousand, three hundred thirty-one".