155443040221 has 16 divisors (see below), whose sum is σ = 180725718528. Its totient is φ = 130933468800.

The previous prime is 155443040201. The next prime is 155443040227. The reversal of 155443040221 is 122040344551.

It is a cyclic number.

It is not a de Polignac number, because 155443040221 - 2⁹ = 155443039709 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 (155443040227) 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 15 ways as a sum of consecutive naturals, for example, 305961 + ... + 636001.

It is an arithmetic number, because the mean of its divisors is an integer number (11295357408).

Almost surely, 2^155443040221 is an apocalyptic number.

It is an amenable number.

155443040221 is a deficient number, since it is larger than the sum of its proper divisors (25282678307).

155443040221 is a wasteful number, since it uses less digits than its factorization.

155443040221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331212.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 155443040221 its reverse (122040344551), we get a palindrome (277483384772).

The spelling of 155443040221 in words is "one hundred fifty-five billion, four hundred forty-three million, forty thousand, two hundred twenty-one".