1221112201011 has 4 divisors (see below), whose sum is σ = 1628149601352. Its totient is φ = 814074800672.

The previous prime is 1221112201003. The next prime is 1221112201031. The reversal of 1221112201011 is 1101022111221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1221112201011 - 2³ = 1221112201003 is a prime.

It is a super-2 number, since 2×1221112201011² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221112201031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203518700166 + ... + 203518700171.

It is an arithmetic number, because the mean of its divisors is an integer number (407037400338).

Almost surely, 2^{1221112201011} is an apocalyptic number.

1221112201011 is a deficient number, since it is larger than the sum of its proper divisors (407037400341).

1221112201011 is an equidigital number, since it uses as much as digits as its factorization.

1221112201011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407037400340.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1221112201011 its reverse (1101022111221), we get a palindrome (2322134312232).

The spelling of 1221112201011 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, two hundred one thousand, eleven".