1124120021 has 4 divisors (see below), whose sum is σ = 1129826412. Its totient is φ = 1118413632.

The previous prime is 1124120003. The next prime is 1124120027. The reversal of 1124120021 is 1200214211.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 986902225 + 137217796 = 31415^2 + 11714^2 .

It is a cyclic number.

It is not a de Polignac number, because 1124120021 - 2⁶ = 1124119957 is a prime.

It is a super-2 number, since 2×1124120021² = 2527291643226080882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1124119978 and 1124120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1124120027) 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 3 ways as a sum of consecutive naturals, for example, 2852900 + ... + 2853293.

It is an arithmetic number, because the mean of its divisors is an integer number (282456603).

Almost surely, 2^1124120021 is an apocalyptic number.

It is an amenable number.

1124120021 is a deficient number, since it is larger than the sum of its proper divisors (5706391).

1124120021 is an equidigital number, since it uses as much as digits as its factorization.

1124120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5706390.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1124120021 is about 33527.8991438474. The cubic root of 1124120021 is about 1039.7706659635.

Adding to 1124120021 its reverse (1200214211), we get a palindrome (2324334232).

The spelling of 1124120021 in words is "one billion, one hundred twenty-four million, one hundred twenty thousand, twenty-one".