2131221044 has 6 divisors (see below), whose sum is σ = 3729636834. Its totient is φ = 1065610520.

The previous prime is 2131221011. The next prime is 2131221061. The reversal of 2131221044 is 4401221312.

It can be written as a sum of positive squares in only one way, i.e., 2066611600 + 64609444 = 45460^2 + 8038^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 266402627 + ... + 266402634.

It is an arithmetic number, because the mean of its divisors is an integer number (621606139).

Almost surely, 2^2131221044 is an apocalyptic number.

It is an amenable number.

2131221044 is a deficient number, since it is larger than the sum of its proper divisors (1598415790).

2131221044 is a wasteful number, since it uses less digits than its factorization.

2131221044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532805265 (or 532805263 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 2131221044 is about 46165.1496694205. The cubic root of 2131221044 is about 1286.8941656427.

Adding to 2131221044 its reverse (4401221312), we get a palindrome (6532442356).

The spelling of 2131221044 in words is "two billion, one hundred thirty-one million, two hundred twenty-one thousand, forty-four".