121720766 has 8 divisors (see below), whose sum is σ = 182740584. Its totient is φ = 60807240.

The previous prime is 121720763. The next prime is 121720769. The reversal of 121720766 is 667027121.

It is an interprime number because it is at equal distance from previous prime (121720763) and next prime (121720769).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121720763) 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, 23645 + ... + 28328.

It is an arithmetic number, because the mean of its divisors is an integer number (22842573).

Almost surely, 2^121720766 is an apocalyptic number.

121720766 is a deficient number, since it is larger than the sum of its proper divisors (61019818).

121720766 is a wasteful number, since it uses less digits than its factorization.

121720766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53146.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 121720766 is about 11032.7134468362. The cubic root of 121720766 is about 495.5888865986.

Adding to 121720766 its reverse (667027121), we get a palindrome (788747887).

The spelling of 121720766 in words is "one hundred twenty-one million, seven hundred twenty thousand, seven hundred sixty-six".