2155596421 has 8 divisors (see below), whose sum is σ = 2365642944. Its totient is φ = 1947897120.

The previous prime is 2155596397. The next prime is 2155596433. The reversal of 2155596421 is 1246955512.

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 2155596421 - 2⁵ = 2155596389 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 (2155596461) 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, 584880 + ... + 588553.

It is an arithmetic number, because the mean of its divisors is an integer number (295705368).

Almost surely, 2^2155596421 is an apocalyptic number.

It is an amenable number.

2155596421 is a deficient number, since it is larger than the sum of its proper divisors (210046523).

2155596421 is a wasteful number, since it uses less digits than its factorization.

2155596421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173611.

The product of its digits is 108000, while the sum is 40.

The square root of 2155596421 is about 46428.4010170499. The cubic root of 2155596421 is about 1291.7817697736.

The spelling of 2155596421 in words is "two billion, one hundred fifty-five million, five hundred ninety-six thousand, four hundred twenty-one".