1551231221422 has 16 divisors (see below), whose sum is σ = 2428042106880. Its totient is φ = 741884630872.

The previous prime is 1551231221401. The next prime is 1551231221431. The reversal of 1551231221422 is 2241221321551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5860779 + ... + 6119737.

It is an arithmetic number, because the mean of its divisors is an integer number (151752631680).

Almost surely, 2^{1551231221422} is an apocalyptic number.

1551231221422 is a deficient number, since it is larger than the sum of its proper divisors (876810885458).

1551231221422 is a wasteful number, since it uses less digits than its factorization.

1551231221422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389207.

The product of its digits is 9600, while the sum is 31.

Adding to 1551231221422 its reverse (2241221321551), we get a palindrome (3792452542973).

The spelling of 1551231221422 in words is "one trillion, five hundred fifty-one billion, two hundred thirty-one million, two hundred twenty-one thousand, four hundred twenty-two".