121201601720 has 32 divisors (see below), whose sum is σ = 272960241120. Its totient is φ = 48435016320.

The previous prime is 121201601687. The next prime is 121201601761. The reversal of 121201601720 is 27106102121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1382711 + ... + 1467750.

It is an arithmetic number, because the mean of its divisors is an integer number (8530007535).

Almost surely, 2^121201601720 is an apocalyptic number.

121201601720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121201601720 is an abundant number, since it is smaller than the sum of its proper divisors (151758639400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121201601720 is a wasteful number, since it uses less digits than its factorization.

121201601720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2851535 (or 2851531 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 23.

Adding to 121201601720 its reverse (27106102121), we get a palindrome (148307703841).

The spelling of 121201601720 in words is "one hundred twenty-one billion, two hundred one million, six hundred one thousand, seven hundred twenty".