151113221221 has 8 divisors (see below), whose sum is σ = 160009008984. Its totient is φ = 142218186240.

The previous prime is 151113221201. The next prime is 151113221249. The reversal of 151113221221 is 122122311151.

It can be written as a sum of positive squares in 4 ways, for example, as 70166712100 + 80946509121 = 264890^2 + 284511^2 .

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 151113221221 - 2¹³ = 151113213029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 151113221192 and 151113221201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151113221201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254931 + ... + 605983.

It is an arithmetic number, because the mean of its divisors is an integer number (20001126123).

Almost surely, 2^151113221221 is an apocalyptic number.

It is an amenable number.

151113221221 is a deficient number, since it is larger than the sum of its proper divisors (8895787763).

151113221221 is a wasteful number, since it uses less digits than its factorization.

151113221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376391.

The product of its digits is 240, while the sum is 22.

Adding to 151113221221 its reverse (122122311151), we get a palindrome (273235532372).

The spelling of 151113221221 in words is "one hundred fifty-one billion, one hundred thirteen million, two hundred twenty-one thousand, two hundred twenty-one".