1212121021099 has 8 divisors (see below), whose sum is σ = 1214344312128. Its totient is φ = 1209899352000.

The previous prime is 1212121021049. The next prime is 1212121021117. The reversal of 1212121021099 is 9901201212121.

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 1212121021099 - 2²⁷ = 1211986803371 is a prime.

It is a super-3 number, since 3×1212121021099³ (a number of 37 digits) contains 333 as substring.

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 1212121021099.

It is not an unprimeable number, because it can be changed into a prime (1212121021049) 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, 1095639 + ... + 1903855.

It is an arithmetic number, because the mean of its divisors is an integer number (151793039016).

Almost surely, 2^{1212121021099} is an apocalyptic number.

1212121021099 is a deficient number, since it is larger than the sum of its proper divisors (2223291029).

1212121021099 is an equidigital number, since it uses as much as digits as its factorization.

1212121021099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810965.

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

The spelling of 1212121021099 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, twenty-one thousand, ninety-nine".