155000221921238 has 32 divisors (see below), whose sum is σ = 252303019444224. Its totient is φ = 71137079402112.

The previous prime is 155000221921217. The next prime is 155000221921301. The reversal of 155000221921238 is 832129122000551.

It is a junction number, because it is equal to n+sod(n) for n = 155000221921195 and 155000221921204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170919470 + ... + 171823937.

It is an arithmetic number, because the mean of its divisors is an integer number (7884469357632).

Almost surely, 2^{155000221921238} is an apocalyptic number.

155000221921238 is a deficient number, since it is larger than the sum of its proper divisors (97302797522986).

155000221921238 is a wasteful number, since it uses less digits than its factorization.

155000221921238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342743756.

The product of its (nonzero) digits is 86400, while the sum is 41.

Adding to 155000221921238 its reverse (832129122000551), we get a palindrome (987129343921789).

The spelling of 155000221921238 in words is "one hundred fifty-five trillion, two hundred twenty-one million, nine hundred twenty-one thousand, two hundred thirty-eight".