105031921 has 4 divisors (see below), whose sum is σ = 105859072. Its totient is φ = 104204772.

The previous prime is 105031919. The next prime is 105031957. The reversal of 105031921 is 129130501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 129130501 = 7591 ⋅17011.

It is a cyclic number.

It is not a de Polignac number, because 105031921 - 2¹ = 105031919 is a prime.

It is a super-2 number, since 2×105031921² = 22063408857900482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 105031892 and 105031901.

It is not an unprimeable number, because it can be changed into a prime (105031991) 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, 413385 + ... + 413638.

It is an arithmetic number, because the mean of its divisors is an integer number (26464768).

Almost surely, 2^105031921 is an apocalyptic number.

It is an amenable number.

105031921 is a deficient number, since it is larger than the sum of its proper divisors (827151).

105031921 is an equidigital number, since it uses as much as digits as its factorization.

105031921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827150.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 105031921 is about 10248.5082329088. The cubic root of 105031921 is about 471.8172006512.

The spelling of 105031921 in words is "one hundred five million, thirty-one thousand, nine hundred twenty-one".