109939021 has 2 divisors, whose sum is σ = 109939022. Its totient is φ = 109939020.

The previous prime is 109938967. The next prime is 109939031. The reversal of 109939021 is 120939901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65383396 + 44555625 = 8086^2 + 6675^2 .

It is a cyclic number.

It is not a de Polignac number, because 109939021 - 2⁹ = 109938509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109939031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54969510 + 54969511.

It is an arithmetic number, because the mean of its divisors is an integer number (54969511).

Almost surely, 2^109939021 is an apocalyptic number.

It is an amenable number.

109939021 is a deficient number, since it is larger than the sum of its proper divisors (1).

109939021 is an equidigital number, since it uses as much as digits as its factorization.

109939021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 109939021 is about 10485.1810189429. The cubic root of 109939021 is about 479.0534311615.

The spelling of 109939021 in words is "one hundred nine million, nine hundred thirty-nine thousand, twenty-one".