120221561355 has 32 divisors (see below), whose sum is σ = 219846720000. Its totient is φ = 54955176192.

The previous prime is 120221561329. The next prime is 120221561377. The reversal of 120221561355 is 553165122021.

It is not a de Polignac number, because 120221561355 - 2¹¹ = 120221559307 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3373671 + ... + 3409119.

It is an arithmetic number, because the mean of its divisors is an integer number (6870210000).

Almost surely, 2^120221561355 is an apocalyptic number.

120221561355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

120221561355 is a deficient number, since it is larger than the sum of its proper divisors (99625158645).

120221561355 is a wasteful number, since it uses less digits than its factorization.

120221561355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67763.

The product of its (nonzero) digits is 18000, while the sum is 33.

Adding to 120221561355 its reverse (553165122021), we get a palindrome (673386683376).

The spelling of 120221561355 in words is "one hundred twenty billion, two hundred twenty-one million, five hundred sixty-one thousand, three hundred fifty-five".