1212101021999 has 6 divisors (see below), whose sum is σ = 1409995066464. Its totient is φ = 1038943733100.

The previous prime is 1212101021983. The next prime is 1212101022031. The reversal of 1212101021999 is 9991201012121.

It is not a de Polignac number, because 1212101021999 - 2⁴ = 1212101021983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212101011999) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12368377727 + ... + 12368377824.

It is an arithmetic number, because the mean of its divisors is an integer number (234999177744).

Almost surely, 2^{1212101021999} is an apocalyptic number.

1212101021999 is a deficient number, since it is larger than the sum of its proper divisors (197894044465).

1212101021999 is an equidigital number, since it uses as much as digits as its factorization.

1212101021999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24736755565 (or 24736755558 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 38.

The spelling of 1212101021999 in words is "one trillion, two hundred twelve billion, one hundred one million, twenty-one thousand, nine hundred ninety-nine".