1225191921407 has 4 divisors (see below), whose sum is σ = 1225235422320. Its totient is φ = 1225148420496.

The previous prime is 1225191921361. The next prime is 1225191921461. The reversal of 1225191921407 is 7041291915221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1225191921407 - 2¹⁰ = 1225191920383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225191921907) 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, 21708182 + ... + 21764547.

It is an arithmetic number, because the mean of its divisors is an integer number (306308855580).

Almost surely, 2^{1225191921407} is an apocalyptic number.

1225191921407 is a deficient number, since it is larger than the sum of its proper divisors (43500913).

1225191921407 is an equidigital number, since it uses as much as digits as its factorization.

1225191921407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43500912.

The product of its (nonzero) digits is 90720, while the sum is 44.

The spelling of 1225191921407 in words is "one trillion, two hundred twenty-five billion, one hundred ninety-one million, nine hundred twenty-one thousand, four hundred seven".