2031153221 has 8 divisors (see below), whose sum is σ = 2097581304. Its totient is φ = 1965332160.

The previous prime is 2031153209. The next prime is 2031153233. The reversal of 2031153221 is 1223511302.

It is an interprime number because it is at equal distance from previous prime (2031153209) and next prime (2031153233).

It can be written as a sum of positive squares in 4 ways, for example, as 208802500 + 1822350721 = 14450^2 + 42689^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2031153221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2031153193 and 2031153202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2031153281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144950 + ... + 158343.

It is an arithmetic number, because the mean of its divisors is an integer number (262197663).

Almost surely, 2^2031153221 is an apocalyptic number.

It is an amenable number.

2031153221 is a deficient number, since it is larger than the sum of its proper divisors (66428083).

2031153221 is a wasteful number, since it uses less digits than its factorization.

2031153221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303511.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 2031153221 is about 45068.3172639050. The cubic root of 2031153221 is about 1266.4291411114.

Adding to 2031153221 its reverse (1223511302), we get a palindrome (3254664523).

The spelling of 2031153221 in words is "two billion, thirty-one million, one hundred fifty-three thousand, two hundred twenty-one".