1221111135235 has 16 divisors (see below), whose sum is σ = 1505037938976. Its totient is φ = 950422733568.

The previous prime is 1221111135227. The next prime is 1221111135263. The reversal of 1221111135235 is 5325311111221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1221111135235 - 2³ = 1221111135227 is a prime.

It is a super-2 number, since 2×1221111135235² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2643247 + ... + 3070663.

It is an arithmetic number, because the mean of its divisors is an integer number (94064871186).

Almost surely, 2^{1221111135235} is an apocalyptic number.

1221111135235 is a deficient number, since it is larger than the sum of its proper divisors (283926803741).

1221111135235 is a wasteful number, since it uses less digits than its factorization.

1221111135235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442902.

The product of its digits is 1800, while the sum is 28.

Adding to 1221111135235 its reverse (5325311111221), we get a palindrome (6546422246456).

The spelling of 1221111135235 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, one hundred thirty-five thousand, two hundred thirty-five".