1211100222021 has 16 divisors (see below), whose sum is σ = 1669006905984. Its totient is φ = 780574826304.

The previous prime is 1211100222019. The next prime is 1211100222029. The reversal of 1211100222021 is 1202220011121.

It is not a de Polignac number, because 1211100222021 - 2¹ = 1211100222019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211100222029) 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, 34730385 + ... + 34765238.

It is an arithmetic number, because the mean of its divisors is an integer number (104312931624).

Almost surely, 2^{1211100222021} is an apocalyptic number.

It is an amenable number.

1211100222021 is a deficient number, since it is larger than the sum of its proper divisors (457906683963).

1211100222021 is a wasteful number, since it uses less digits than its factorization.

1211100222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69495820.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1211100222021 its reverse (1202220011121), we get a palindrome (2413320233142).

The spelling of 1211100222021 in words is "one trillion, two hundred eleven billion, one hundred million, two hundred twenty-two thousand, twenty-one".