1222124521 has 4 divisors (see below), whose sum is σ = 1223277444. Its totient is φ = 1220971600.

The previous prime is 1222124483. The next prime is 1222124539. The reversal of 1222124521 is 1254212221.

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 507150400 + 714974121 = 22520^2 + 26739^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222124521 - 2⁹ = 1222124009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1222124492 and 1222124501.

It is not an unprimeable number, because it can be changed into a prime (1222124591) 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, 574870 + ... + 576991.

It is an arithmetic number, because the mean of its divisors is an integer number (305819361).

Almost surely, 2^1222124521 is an apocalyptic number.

It is an amenable number.

1222124521 is a deficient number, since it is larger than the sum of its proper divisors (1152923).

1222124521 is a wasteful number, since it uses less digits than its factorization.

1222124521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152922.

The product of its digits is 640, while the sum is 22.

The square root of 1222124521 is about 34958.8975941748. The cubic root of 1222124521 is about 1069.1496201463.

Adding to 1222124521 its reverse (1254212221), we get a palindrome (2476336742).

The spelling of 1222124521 in words is "one billion, two hundred twenty-two million, one hundred twenty-four thousand, five hundred twenty-one".