109890121 has 8 divisors (see below), whose sum is σ = 121068288. Its totient is φ = 98910000.

The previous prime is 109890103. The next prime is 109890149. The reversal of 109890121 is 121098901.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 109890121 - 2¹³ = 109881929 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (109890101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48345 + ... + 50566.

It is an arithmetic number, because the mean of its divisors is an integer number (15133536).

Almost surely, 2^109890121 is an apocalyptic number.

109890121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

109890121 is a deficient number, since it is larger than the sum of its proper divisors (11178167).

109890121 is a wasteful number, since it uses less digits than its factorization.

109890121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99023.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 109890121 is about 10482.8488971272. The cubic root of 109890121 is about 478.9823942460.

It can be divided in two parts, 109890 and 121, that added together give a palindrome (110011).

The spelling of 109890121 in words is "one hundred nine million, eight hundred ninety thousand, one hundred twenty-one".