108021457 has 4 divisors (see below), whose sum is σ = 108042660. Its totient is φ = 108000256.

The previous prime is 108021439. The next prime is 108021467. The reversal of 108021457 is 754120801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 754120801 = 7 ⋅107731543.

It can be written as a sum of positive squares in 2 ways, for example, as 64144081 + 43877376 = 8009^2 + 6624^2 .

It is a cyclic number.

It is not a de Polignac number, because 108021457 - 2¹¹ = 108019409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108021427) 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, 2169 + ... + 14857.

It is an arithmetic number, because the mean of its divisors is an integer number (27010665).

Almost surely, 2^108021457 is an apocalyptic number.

It is an amenable number.

108021457 is a deficient number, since it is larger than the sum of its proper divisors (21203).

108021457 is an equidigital number, since it uses as much as digits as its factorization.

108021457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21202.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 108021457 is about 10393.3371445364. The cubic root of 108021457 is about 476.2518513395.

The spelling of 108021457 in words is "one hundred eight million, twenty-one thousand, four hundred fifty-seven".