1221353177149 has 4 divisors (see below), whose sum is σ = 1395832202464. Its totient is φ = 1046874151836.

The previous prime is 1221353177147. The next prime is 1221353177167. The reversal of 1221353177149 is 9417713531221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221353177149 - 2¹ = 1221353177147 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221353177099 and 1221353177108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221353177147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87239512647 + ... + 87239512660.

It is an arithmetic number, because the mean of its divisors is an integer number (348958050616).

Almost surely, 2^{1221353177149} is an apocalyptic number.

It is an amenable number.

1221353177149 is a deficient number, since it is larger than the sum of its proper divisors (174479025315).

1221353177149 is an equidigital number, since it uses as much as digits as its factorization.

1221353177149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174479025314.

The product of its digits is 317520, while the sum is 46.

The spelling of 1221353177149 in words is "one trillion, two hundred twenty-one billion, three hundred fifty-three million, one hundred seventy-seven thousand, one hundred forty-nine".