2012221131 has 4 divisors (see below), whose sum is σ = 2682961512. Its totient is φ = 1341480752.

The previous prime is 2012221121. The next prime is 2012221151. The reversal of 2012221131 is 1311222102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2012221131 is a prime.

It is a super-2 number, since 2×2012221131² = 8098067760085838322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2012221131.

It is not an unprimeable number, because it can be changed into a prime (2012221111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335370186 + ... + 335370191.

It is an arithmetic number, because the mean of its divisors is an integer number (670740378).

Almost surely, 2^2012221131 is an apocalyptic number.

2012221131 is a deficient number, since it is larger than the sum of its proper divisors (670740381).

2012221131 is an equidigital number, since it uses as much as digits as its factorization.

2012221131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670740380.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2012221131 is about 44857.7878522782. The cubic root of 2012221131 is about 1262.4821171339.

Adding to 2012221131 its reverse (1311222102), we get a palindrome (3323443233).

The spelling of 2012221131 in words is "two billion, twelve million, two hundred twenty-one thousand, one hundred thirty-one".