1221211002099 has 32 divisors (see below), whose sum is σ = 1806559764480. Its totient is φ = 727524554400.

The previous prime is 1221211002097. The next prime is 1221211002103. The reversal of 1221211002099 is 9902001121221.

It is not a de Polignac number, because 1221211002099 - 2¹ = 1221211002097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221211002097) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41820594 + ... + 41849784.

It is an arithmetic number, because the mean of its divisors is an integer number (56454992640).

Almost surely, 2^{1221211002099} is an apocalyptic number.

1221211002099 is a deficient number, since it is larger than the sum of its proper divisors (585348762381).

1221211002099 is a wasteful number, since it uses less digits than its factorization.

1221211002099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50751.

The product of its (nonzero) digits is 1296, while the sum is 30.

The spelling of 1221211002099 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, two thousand, ninety-nine".