121220103635 has 32 divisors (see below), whose sum is σ = 147559421952. Its totient is φ = 95591301120.

The previous prime is 121220103623. The next prime is 121220103637. The reversal of 121220103635 is 536301022121.

It is a happy number.

It is not a de Polignac number, because 121220103635 - 2¹⁶ = 121220038099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121220103637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88287809 + ... + 88289181.

It is an arithmetic number, because the mean of its divisors is an integer number (4611231936).

Almost surely, 2^121220103635 is an apocalyptic number.

121220103635 is a deficient number, since it is larger than the sum of its proper divisors (26339318317).

121220103635 is a wasteful number, since it uses less digits than its factorization.

121220103635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2303.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 121220103635 its reverse (536301022121), we get a palindrome (657521125756).

The spelling of 121220103635 in words is "one hundred twenty-one billion, two hundred twenty million, one hundred three thousand, six hundred thirty-five".