1021212211099 has 4 divisors (see below), whose sum is σ = 1022251085136. Its totient is φ = 1020173337064.

The previous prime is 1021212211039. The next prime is 1021212211111. The reversal of 1021212211099 is 9901122121201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1021212211099 - 2¹⁹ = 1021211686811 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 1021212211099.

It is not an unprimeable number, because it can be changed into a prime (1021212211039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 519435544 + ... + 519437509.

It is an arithmetic number, because the mean of its divisors is an integer number (255562771284).

Almost surely, 2^{1021212211099} is an apocalyptic number.

1021212211099 is a deficient number, since it is larger than the sum of its proper divisors (1038874037).

1021212211099 is an equidigital number, since it uses as much as digits as its factorization.

1021212211099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038874036.

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

The spelling of 1021212211099 in words is "one trillion, twenty-one billion, two hundred twelve million, two hundred eleven thousand, ninety-nine".