100155321 has 24 divisors (see below), whose sum is σ = 166100480. Its totient is φ = 56966976.

The previous prime is 100155301. The next prime is 100155323. The reversal of 100155321 is 123551001.

It is not a de Polignac number, because 100155321 - 2⁶ = 100155257 is a prime.

It is a super-2 number, since 2×100155321² = 20062176649226082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 100155294 and 100155303.

It is not an unprimeable number, because it can be changed into a prime (100155323) 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, 10485 + ... + 17613.

Almost surely, 2^100155321 is an apocalyptic number.

It is an amenable number.

100155321 is a deficient number, since it is larger than the sum of its proper divisors (65945159).

100155321 is a wasteful number, since it uses less digits than its factorization.

100155321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7365 (or 7362 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 100155321 is about 10007.7630367630. The cubic root of 100155321 is about 464.3990711232.

The spelling of 100155321 in words is "one hundred million, one hundred fifty-five thousand, three hundred twenty-one".