3231155421 has 64 divisors (see below), whose sum is σ = 5270496000. Its totient is φ = 1944311040.

The previous prime is 3231155399. The next prime is 3231155449. The reversal of 3231155421 is 1245511323.

3231155421 is a `hidden beast` number, since 3 + 2 + 3 + 115 + 542 + 1 = 666.

It is not a de Polignac number, because 3231155421 - 2⁹ = 3231154909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3231155461) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4902790 + ... + 4903448.

It is an arithmetic number, because the mean of its divisors is an integer number (82351500).

Almost surely, 2^3231155421 is an apocalyptic number.

It is an amenable number.

3231155421 is a deficient number, since it is larger than the sum of its proper divisors (2039340579).

3231155421 is a wasteful number, since it uses less digits than its factorization.

3231155421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971 (or 965 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 3231155421 is about 56843.2530824899. The cubic root of 3231155421 is about 1478.3795602923.

Adding to 3231155421 its reverse (1245511323), we get a palindrome (4476666744).

The spelling of 3231155421 in words is "three billion, two hundred thirty-one million, one hundred fifty-five thousand, four hundred twenty-one".