109780921 has 4 divisors (see below), whose sum is σ = 113566500. Its totient is φ = 105995344.

The previous prime is 109780919. The next prime is 109780927. The reversal of 109780921 is 129087901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129087901 = 211 ⋅611791.

It can be written as a sum of positive squares in 2 ways, for example, as 71588521 + 38192400 = 8461^2 + 6180^2 .

It is a cyclic number.

It is not a de Polignac number, because 109780921 - 2¹ = 109780919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109780927) 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, 1892746 + ... + 1892803.

It is an arithmetic number, because the mean of its divisors is an integer number (28391625).

Almost surely, 2^109780921 is an apocalyptic number.

It is an amenable number.

109780921 is a deficient number, since it is larger than the sum of its proper divisors (3785579).

109780921 is an equidigital number, since it uses as much as digits as its factorization.

109780921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3785578.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 109780921 is about 10477.6390947579. The cubic root of 109780921 is about 478.8236835508.

The spelling of 109780921 in words is "one hundred nine million, seven hundred eighty thousand, nine hundred twenty-one".