2121631122724 has 27 divisors (see below), whose sum is σ = 3801432396657. Its totient is φ = 1036084255584.

The previous prime is 2121631122713. The next prime is 2121631122769. The reversal of 2121631122724 is 4272211361212.

The square root of 2121631122724 is 1456582.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 735906622500 + 1385724500224 = 857850^2 + 1177168^2 .

It is a super-4 number, since 4×2121631122724⁴ (a number of 50 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121631122724.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 125257584 + ... + 125274520.

Almost surely, 2^{2121631122724} is an apocalyptic number.

2121631122724 is the 1456582-nd square number.

It is an amenable number.

2121631122724 is a deficient number, since it is larger than the sum of its proper divisors (1679801273933).

2121631122724 is an frugal number, since it uses more digits than its factorization.

2121631122724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33964 (or 16982 counting only the distinct ones).

The product of its digits is 16128, while the sum is 34.

Adding to 2121631122724 its reverse (4272211361212), we get a palindrome (6393842483936).

The spelling of 2121631122724 in words is "two trillion, one hundred twenty-one billion, six hundred thirty-one million, one hundred twenty-two thousand, seven hundred twenty-four".