1211110200021 has 8 divisors (see below), whose sum is σ = 1614883819104. Its totient is φ = 807371690480.

The previous prime is 1211110200017. The next prime is 1211110200023. The reversal of 1211110200021 is 1200020111121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211110200021 - 2² = 1211110200017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211110200023) 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 7 ways as a sum of consecutive naturals, for example, 8696790 + ... + 8834951.

It is an arithmetic number, because the mean of its divisors is an integer number (201860477388).

Almost surely, 2^{1211110200021} is an apocalyptic number.

It is an amenable number.

1211110200021 is a deficient number, since it is larger than the sum of its proper divisors (403773619083).

1211110200021 is a wasteful number, since it uses less digits than its factorization.

1211110200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17554771.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1211110200021 its reverse (1200020111121), we get a palindrome (2411130311142).

The spelling of 1211110200021 in words is "one trillion, two hundred eleven billion, one hundred ten million, two hundred thousand, twenty-one".