155045055400021 has 8 divisors (see below), whose sum is σ = 155331627431904. Its totient is φ = 154758523018800.

The previous prime is 155045055400003. The next prime is 155045055400049. The reversal of 155045055400021 is 120004550540551.

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 155045055400021 - 2⁷ = 155045055399893 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 (155045055400051) 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, 2079171 + ... + 17731696.

It is an arithmetic number, because the mean of its divisors is an integer number (19416453428988).

Almost surely, 2^{155045055400021} is an apocalyptic number.

It is an amenable number.

155045055400021 is a deficient number, since it is larger than the sum of its proper divisors (286572031883).

155045055400021 is a wasteful number, since it uses less digits than its factorization.

155045055400021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19825331.

The product of its (nonzero) digits is 100000, while the sum is 37.

The spelling of 155045055400021 in words is "one hundred fifty-five trillion, forty-five billion, fifty-five million, four hundred thousand, twenty-one".