155432224021 has 8 divisors (see below), whose sum is σ = 156603585600. Its totient is φ = 154261621920.

The previous prime is 155432224019. The next prime is 155432224091. The reversal of 155432224021 is 120422234551.

It is a happy number.

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 155432224021 - 2¹ = 155432224019 is a prime.

It is a super-2 number, since 2×155432224021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155432224091) 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, 224376 + ... + 601006.

It is an arithmetic number, because the mean of its divisors is an integer number (19575448200).

Almost surely, 2^155432224021 is an apocalyptic number.

It is an amenable number.

155432224021 is a deficient number, since it is larger than the sum of its proper divisors (1171361579).

155432224021 is a wasteful number, since it uses less digits than its factorization.

155432224021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379739.

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

Adding to 155432224021 its reverse (120422234551), we get a palindrome (275854458572).

The spelling of 155432224021 in words is "one hundred fifty-five billion, four hundred thirty-two million, two hundred twenty-four thousand, twenty-one".