121720762 has 4 divisors (see below), whose sum is σ = 182581146. Its totient is φ = 60860380.

The previous prime is 121720747. The next prime is 121720763. The reversal of 121720762 is 267027121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 111281401 + 10439361 = 10549^2 + 3231^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121720762.

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 as a sum of consecutive naturals, namely, 30430189 + ... + 30430192.

Almost surely, 2^121720762 is an apocalyptic number.

121720762 is a deficient number, since it is larger than the sum of its proper divisors (60860384).

121720762 is an equidigital number, since it uses as much as digits as its factorization.

121720762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60860383.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 121720762 is about 11032.7132655571. The cubic root of 121720762 is about 495.5888811699.

Adding to 121720762 its reverse (267027121), we get a palindrome (388747883).

The spelling of 121720762 in words is "one hundred twenty-one million, seven hundred twenty thousand, seven hundred sixty-two".