121742247 has 16 divisors (see below), whose sum is σ = 181867392. Its totient is φ = 71788320.

The previous prime is 121742237. The next prime is 121742251. The reversal of 121742247 is 742247121.

It is not a de Polignac number, because 121742247 - 2⁷ = 121742119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121742227) 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, 48633 + ... + 51074.

It is an arithmetic number, because the mean of its divisors is an integer number (11366712).

Almost surely, 2^121742247 is an apocalyptic number.

121742247 is a deficient number, since it is larger than the sum of its proper divisors (60125145).

121742247 is a wasteful number, since it uses less digits than its factorization.

121742247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99758.

The product of its digits is 6272, while the sum is 30.

The square root of 121742247 is about 11033.6869177986. The cubic root of 121742247 is about 495.6180383449.

Adding to 121742247 its reverse (742247121), we get a palindrome (863989368).

The spelling of 121742247 in words is "one hundred twenty-one million, seven hundred forty-two thousand, two hundred forty-seven".