101909121 has 16 divisors (see below), whose sum is σ = 140625408. Its totient is φ = 65577600.

The previous prime is 101909117. The next prime is 101909147. The reversal of 101909121 is 121909101.

It is not a de Polignac number, because 101909121 - 2² = 101909117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101909091 and 101909100.

It is not an unprimeable number, because it can be changed into a prime (101909111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41685 + ... + 44061.

It is an arithmetic number, because the mean of its divisors is an integer number (8789088).

Almost surely, 2^101909121 is an apocalyptic number.

It is an amenable number.

101909121 is a deficient number, since it is larger than the sum of its proper divisors (38716287).

101909121 is a wasteful number, since it uses less digits than its factorization.

101909121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2872.

The product of its (nonzero) digits is 162, while the sum is 24.

The square root of 101909121 is about 10095.0047548280. The cubic root of 101909121 is about 467.0940680212.

The spelling of 101909121 in words is "one hundred one million, nine hundred nine thousand, one hundred twenty-one".