121721071 has 8 divisors (see below), whose sum is σ = 131066640. Its totient is φ = 112618368.

The previous prime is 121721069. The next prime is 121721099. The reversal of 121721071 is 170127121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121721071 - 2¹ = 121721069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121721021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59676 + ... + 61681.

It is an arithmetic number, because the mean of its divisors is an integer number (16383330).

Almost surely, 2^121721071 is an apocalyptic number.

121721071 is a deficient number, since it is larger than the sum of its proper divisors (9345569).

121721071 is a wasteful number, since it uses less digits than its factorization.

121721071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121433.

The product of its (nonzero) digits is 196, while the sum is 22.

The square root of 121721071 is about 11032.7272693564. The cubic root of 121721071 is about 495.5893005364.

Adding to 121721071 its reverse (170127121), we get a palindrome (291848192).

The spelling of 121721071 in words is "one hundred twenty-one million, seven hundred twenty-one thousand, seventy-one".