121109999999 has 32 divisors (see below), whose sum is σ = 132183539712. Its totient is φ = 110512512000.

The previous prime is 121109999987. The next prime is 121110000007. The reversal of 121109999999 is 999999901121.

It is not a de Polignac number, because 121109999999 - 2⁸ = 121109999743 is a prime.

121109999999 is a modest number, since divided by 999999 gives 121109 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121109999909) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122209394 + ... + 122210384.

It is an arithmetic number, because the mean of its divisors is an integer number (4130735616).

Almost surely, 2^121109999999 is an apocalyptic number.

121109999999 is a deficient number, since it is larger than the sum of its proper divisors (11073539713).

121109999999 is a wasteful number, since it uses less digits than its factorization.

121109999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1967.

The product of its (nonzero) digits is 9565938, while the sum is 68.

The spelling of 121109999999 in words is "one hundred twenty-one billion, one hundred nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".