121742117 has 18 divisors (see below), whose sum is σ = 150456402. Its totient is φ = 98200704.

The previous prime is 121742107. The next prime is 121742119. The reversal of 121742117 is 711247121.

It can be written as a sum of positive squares in 3 ways, for example, as 62236321 + 59505796 = 7889^2 + 7714^2 .

It is not a de Polignac number, because 121742117 - 2⁸ = 121741861 is a prime.

It is a super-2 number, since 2×121742117² = 29642286103283378, which contains 22 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 (121742119) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9863 + ... + 18459.

It is an arithmetic number, because the mean of its divisors is an integer number (8358689).

Almost surely, 2^121742117 is an apocalyptic number.

121742117 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

121742117 is a deficient number, since it is larger than the sum of its proper divisors (28714285).

121742117 is an equidigital number, since it uses as much as digits as its factorization.

121742117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8645 (or 8621 counting only the distinct ones).

The product of its digits is 784, while the sum is 26.

The square root of 121742117 is about 11033.6810267471. The cubic root of 121742117 is about 495.6178619330.

Adding to 121742117 its reverse (711247121), we get a palindrome (832989238).

It can be divided in two parts, 1217 and 42117, that added together give a palindrome (43334).

The spelling of 121742117 in words is "one hundred twenty-one million, seven hundred forty-two thousand, one hundred seventeen".