1245224121 has 4 divisors (see below), whose sum is σ = 1660298832. Its totient is φ = 830149412.

The previous prime is 1245224119. The next prime is 1245224137. The reversal of 1245224121 is 1214225421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1245224121 - 2¹ = 1245224119 is a prime.

It is a super-2 number, since 2×1245224121² = 3101166223040445282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1245224091 and 1245224100.

It is not an unprimeable number, because it can be changed into a prime (1245224111) 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, 207537351 + ... + 207537356.

It is an arithmetic number, because the mean of its divisors is an integer number (415074708).

Almost surely, 2^1245224121 is an apocalyptic number.

It is an amenable number.

1245224121 is a deficient number, since it is larger than the sum of its proper divisors (415074711).

1245224121 is an equidigital number, since it uses as much as digits as its factorization.

1245224121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415074710.

The product of its digits is 1280, while the sum is 24.

The square root of 1245224121 is about 35287.7332935965. The cubic root of 1245224121 is about 1075.8436848260.

Adding to 1245224121 its reverse (1214225421), we get a palindrome (2459449542).

The spelling of 1245224121 in words is "one billion, two hundred forty-five million, two hundred twenty-four thousand, one hundred twenty-one".