1221025542423 has 8 divisors (see below), whose sum is σ = 1629165427200. Its totient is φ = 813451342968.

The previous prime is 1221025542391. The next prime is 1221025542433. The reversal of 1221025542423 is 3242455201221.

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

It is not a de Polignac number, because 1221025542423 - 2⁵ = 1221025542391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221025542433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141416293 + ... + 141424926.

It is an arithmetic number, because the mean of its divisors is an integer number (203645678400).

Almost surely, 2^{1221025542423} is an apocalyptic number.

1221025542423 is a deficient number, since it is larger than the sum of its proper divisors (408139884777).

1221025542423 is a wasteful number, since it uses less digits than its factorization.

1221025542423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282842661.

The product of its (nonzero) digits is 38400, while the sum is 33.

The spelling of 1221025542423 in words is "one trillion, two hundred twenty-one billion, twenty-five million, five hundred forty-two thousand, four hundred twenty-three".