1211212021099 has 8 divisors (see below), whose sum is σ = 1295681023728. Its totient is φ = 1128212044800.

The previous prime is 1211212021043. The next prime is 1211212021139. The reversal of 1211212021099 is 9901202121121.

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

It is not a de Polignac number, because 1211212021099 - 2⁷ = 1211212020971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211212021099.

It is not an unprimeable number, because it can be changed into a prime (1211212022099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 367254877 + ... + 367258174.

It is an arithmetic number, because the mean of its divisors is an integer number (161960127966).

Almost surely, 2^{1211212021099} is an apocalyptic number.

1211212021099 is a deficient number, since it is larger than the sum of its proper divisors (84469002629).

1211212021099 is an equidigital number, since it uses as much as digits as its factorization.

1211212021099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734513165.

The product of its (nonzero) digits is 1296, while the sum is 31.

The spelling of 1211212021099 in words is "one trillion, two hundred eleven billion, two hundred twelve million, twenty-one thousand, ninety-nine".