1211210012021 has 4 divisors (see below), whose sum is σ = 1218462766752. Its totient is φ = 1203957257292.

The previous prime is 1211210011997. The next prime is 1211210012027. The reversal of 1211210012021 is 1202100121121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211210012021 - 2¹⁴ = 1211209995637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211210011987 and 1211210012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211210012027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3626377115 + ... + 3626377448.

It is an arithmetic number, because the mean of its divisors is an integer number (304615691688).

Almost surely, 2^{1211210012021} is an apocalyptic number.

It is an amenable number.

1211210012021 is a deficient number, since it is larger than the sum of its proper divisors (7252754731).

1211210012021 is an equidigital number, since it uses as much as digits as its factorization.

1211210012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7252754730.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1211210012021 its reverse (1202100121121), we get a palindrome (2413310133142).

The spelling of 1211210012021 in words is "one trillion, two hundred eleven billion, two hundred ten million, twelve thousand, twenty-one".