2155421523 has 8 divisors (see below), whose sum is σ = 2886556608. Its totient is φ = 1430617064.

The previous prime is 2155421473. The next prime is 2155421561. The reversal of 2155421523 is 3251245512.

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 2155421523 - 2¹⁰ = 2155420499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2155420523) 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, 1581861 + ... + 1583222.

It is an arithmetic number, because the mean of its divisors is an integer number (360819576).

Almost surely, 2^2155421523 is an apocalyptic number.

2155421523 is a deficient number, since it is larger than the sum of its proper divisors (731135085).

2155421523 is a wasteful number, since it uses less digits than its factorization.

2155421523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3165313.

The product of its digits is 12000, while the sum is 30.

The square root of 2155421523 is about 46426.5174550062. The cubic root of 2155421523 is about 1291.7468318547.

The spelling of 2155421523 in words is "two billion, one hundred fifty-five million, four hundred twenty-one thousand, five hundred twenty-three".