105420121 has 4 divisors (see below), whose sum is σ = 105480144. Its totient is φ = 105360100.

The previous prime is 105420101. The next prime is 105420149. The reversal of 105420121 is 121024501.

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: 121024501 = 13 ⋅9309577.

It is a cyclic number.

It is not a de Polignac number, because 105420121 - 2¹⁷ = 105289049 is a prime.

It is a super-2 number, since 2×105420121² = 22226803823309282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 105420095 and 105420104.

It is not an unprimeable number, because it can be changed into a prime (105420101) 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, 27295 + ... + 30916.

It is an arithmetic number, because the mean of its divisors is an integer number (26370036).

Almost surely, 2^105420121 is an apocalyptic number.

It is an amenable number.

105420121 is a deficient number, since it is larger than the sum of its proper divisors (60023).

105420121 is an equidigital number, since it uses as much as digits as its factorization.

105420121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60022.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 105420121 is about 10267.4301068963. The cubic root of 105420121 is about 472.3977677910.

Adding to 105420121 its reverse (121024501), we get a palindrome (226444622).

The spelling of 105420121 in words is "one hundred five million, four hundred twenty thousand, one hundred twenty-one".