103992121 has 4 divisors (see below), whose sum is σ = 104192244. Its totient is φ = 103792000.

The previous prime is 103992101. The next prime is 103992127. The reversal of 103992121 is 121299301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121299301 = 17 ⋅7135253.

It can be written as a sum of positive squares in 2 ways, for example, as 33767721 + 70224400 = 5811^2 + 8380^2 .

It is a cyclic number.

It is not a de Polignac number, because 103992121 - 2¹⁵ = 103959353 is a prime.

It is a super-2 number, since 2×103992121² = 21628722460157282, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 103992121.

It is not an unprimeable number, because it can be changed into a prime (103992127) 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, 99280 + ... + 100321.

It is an arithmetic number, because the mean of its divisors is an integer number (26048061).

Almost surely, 2^103992121 is an apocalyptic number.

It is an amenable number.

103992121 is a deficient number, since it is larger than the sum of its proper divisors (200123).

103992121 is an equidigital number, since it uses as much as digits as its factorization.

103992121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200122.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 103992121 is about 10197.6527201116. The cubic root of 103992121 is about 470.2550614968.

The spelling of 103992121 in words is "one hundred three million, nine hundred ninety-two thousand, one hundred twenty-one".