121121010109 has 4 divisors (see below), whose sum is σ = 132132011040. Its totient is φ = 110110009180.

The previous prime is 121121010103. The next prime is 121121010113. The reversal of 121121010109 is 901010121121.

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.

It is a cyclic number.

It is not a de Polignac number, because 121121010109 - 2⁵ = 121121010077 is a prime.

It is a super-3 number, since 3×121121010109³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121010103) 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, 5505500449 + ... + 5505500470.

It is an arithmetic number, because the mean of its divisors is an integer number (33033002760).

Almost surely, 2^121121010109 is an apocalyptic number.

It is an amenable number.

121121010109 is a deficient number, since it is larger than the sum of its proper divisors (11011000931).

121121010109 is a wasteful number, since it uses less digits than its factorization.

121121010109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11011000930.

The product of its (nonzero) digits is 36, while the sum is 19.

The spelling of 121121010109 in words is "one hundred twenty-one billion, one hundred twenty-one million, ten thousand, one hundred nine".