1221004040423 has 8 divisors (see below), whose sum is σ = 1229120209536. Its totient is φ = 1212888267000.

The previous prime is 1221004040407. The next prime is 1221004040447. The reversal of 1221004040423 is 3240404001221.

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 1221004040423 - 2⁴ = 1221004040407 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 (1221004040453) 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, 8658308 + ... + 8798198.

It is an arithmetic number, because the mean of its divisors is an integer number (153640026192).

Almost surely, 2^{1221004040423} is an apocalyptic number.

1221004040423 is a deficient number, since it is larger than the sum of its proper divisors (8116169113).

1221004040423 is a wasteful number, since it uses less digits than its factorization.

1221004040423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197845.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 1221004040423 its reverse (3240404001221), we get a palindrome (4461408041644).

The spelling of 1221004040423 in words is "one trillion, two hundred twenty-one billion, four million, forty thousand, four hundred twenty-three".