3155531040221 has 16 divisors (see below), whose sum is σ = 3614184537600. Its totient is φ = 2698848028800.

The previous prime is 3155531040127. The next prime is 3155531040247. The reversal of 3155531040221 is 1220401355513.

3155531040221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-3155531040221 is a prime.

It is a super-2 number, since 2×3155531040221² (a number of 26 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3155531043221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8007020 + ... + 8391866.

It is an arithmetic number, because the mean of its divisors is an integer number (225886533600).

Almost surely, 2^{3155531040221} is an apocalyptic number.

It is an amenable number.

3155531040221 is a deficient number, since it is larger than the sum of its proper divisors (458653497379).

3155531040221 is a wasteful number, since it uses less digits than its factorization.

3155531040221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387404.

The product of its (nonzero) digits is 18000, while the sum is 32.

Adding to 3155531040221 its reverse (1220401355513), we get a palindrome (4375932395734).

The spelling of 3155531040221 in words is "three trillion, one hundred fifty-five billion, five hundred thirty-one million, forty thousand, two hundred twenty-one".