1211112300021 has 32 divisors (see below), whose sum is σ = 1782433873920. Its totient is φ = 726898463424.

The previous prime is 1211112299993. The next prime is 1211112300043. The reversal of 1211112300021 is 1200032111121.

It is not a de Polignac number, because 1211112300021 - 2¹⁹ = 1211111775733 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 (1211112300091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1779985 + ... + 2364438.

It is an arithmetic number, because the mean of its divisors is an integer number (55701058560).

Almost surely, 2^{1211112300021} is an apocalyptic number.

It is an amenable number.

1211112300021 is a deficient number, since it is larger than the sum of its proper divisors (571321573899).

1211112300021 is a wasteful number, since it uses less digits than its factorization.

1211112300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4144625.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 1211112300021 its reverse (1200032111121), we get a palindrome (2411144411142).

The spelling of 1211112300021 in words is "one trillion, two hundred eleven billion, one hundred twelve million, three hundred thousand, twenty-one".