1011221121201 has 16 divisors (see below), whose sum is σ = 1384888930368. Its totient is φ = 655854408000.

The previous prime is 1011221121199. The next prime is 1011221121221. The reversal of 1011221121201 is 1021211221101.

It is a happy number.

It is not a de Polignac number, because 1011221121201 - 2¹ = 1011221121199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1011221121221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 508051 + ... + 1510151.

It is an arithmetic number, because the mean of its divisors is an integer number (86555558148).

Almost surely, 2^{1011221121201} is an apocalyptic number.

It is an amenable number.

1011221121201 is a deficient number, since it is larger than the sum of its proper divisors (373667809167).

1011221121201 is a wasteful number, since it uses less digits than its factorization.

1011221121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011232.

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

Adding to 1011221121201 its reverse (1021211221101), we get a palindrome (2032432342302).

The spelling of 1011221121201 in words is "one trillion, eleven billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred one".