213121313021099 has 24 divisors (see below), whose sum is σ = 256748242656240. Its totient is φ = 176181796840896.

The previous prime is 213121313021077. The next prime is 213121313021117. The reversal of 213121313021099 is 990120313121312.

It is not a de Polignac number, because 213121313021099 - 2²⁰ = 213121311972523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213121313021699) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81390212 + ... + 83967905.

It is an arithmetic number, because the mean of its divisors is an integer number (10697843444010).

Almost surely, 2^{213121313021099} is an apocalyptic number.

213121313021099 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

213121313021099 is a deficient number, since it is larger than the sum of its proper divisors (43626929635141).

213121313021099 is a wasteful number, since it uses less digits than its factorization.

213121313021099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165359067 (or 165359060 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 38.

The spelling of 213121313021099 in words is "two hundred thirteen trillion, one hundred twenty-one billion, three hundred thirteen million, twenty-one thousand, ninety-nine".