1221908041208 has 8 divisors (see below), whose sum is σ = 2291077577280. Its totient is φ = 610954020600.

The previous prime is 1221908041199. The next prime is 1221908041223. The reversal of 1221908041208 is 8021408091221.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1221908041208² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76369252568 + ... + 76369252583.

It is an arithmetic number, because the mean of its divisors is an integer number (286384697160).

Almost surely, 2^{1221908041208} is an apocalyptic number.

It is an amenable number.

1221908041208 is a deficient number, since it is larger than the sum of its proper divisors (1069169536072).

1221908041208 is a wasteful number, since it uses less digits than its factorization.

1221908041208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152738505157 (or 152738505153 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The spelling of 1221908041208 in words is "one trillion, two hundred twenty-one billion, nine hundred eight million, forty-one thousand, two hundred eight".