1221954217241 has 8 divisors (see below), whose sum is σ = 1233190823040. Its totient is φ = 1210718084688.

The previous prime is 1221954217219. The next prime is 1221954217247. The reversal of 1221954217241 is 1427124591221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221954217241 - 2³⁰ = 1220880475417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221954217247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7063520 + ... + 7234446.

It is an arithmetic number, because the mean of its divisors is an integer number (154148852880).

Almost surely, 2^{1221954217241} is an apocalyptic number.

It is an amenable number.

1221954217241 is a deficient number, since it is larger than the sum of its proper divisors (11236605799).

1221954217241 is a wasteful number, since it uses less digits than its factorization.

1221954217241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236623.

The product of its digits is 80640, while the sum is 41.

The spelling of 1221954217241 in words is "one trillion, two hundred twenty-one billion, nine hundred fifty-four million, two hundred seventeen thousand, two hundred forty-one".