1221413125418 has 8 divisors (see below), whose sum is σ = 1833385842912. Its totient is φ = 610284511116.

The previous prime is 1221413125417. The next prime is 1221413125433. The reversal of 1221413125418 is 8145213141221.

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

It is not an unprimeable number, because it can be changed into a prime (1221413125411) 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, 211022180 + ... + 211027967.

It is an arithmetic number, because the mean of its divisors is an integer number (229173230364).

Almost surely, 2^{1221413125418} is an apocalyptic number.

1221413125418 is a deficient number, since it is larger than the sum of its proper divisors (611972717494).

1221413125418 is a wasteful number, since it uses less digits than its factorization.

1221413125418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422051596.

The product of its digits is 15360, while the sum is 35.

Adding to 1221413125418 its reverse (8145213141221), we get a palindrome (9366626266639).

The spelling of 1221413125418 in words is "one trillion, two hundred twenty-one billion, four hundred thirteen million, one hundred twenty-five thousand, four hundred eighteen".