1242104521 has 16 divisors (see below), whose sum is σ = 1446986880. Its totient is φ = 1044167040.

The previous prime is 1242104519. The next prime is 1242104531. The reversal of 1242104521 is 1254012421.

It is not a de Polignac number, because 1242104521 - 2¹ = 1242104519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1242104492 and 1242104501.

It is not an unprimeable number, because it can be changed into a prime (1242104531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185451 + ... + 192031.

It is an arithmetic number, because the mean of its divisors is an integer number (90436680).

Almost surely, 2^1242104521 is an apocalyptic number.

It is an amenable number.

1242104521 is a deficient number, since it is larger than the sum of its proper divisors (204882359).

1242104521 is an equidigital number, since it uses as much as digits as its factorization.

1242104521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7104.

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

The square root of 1242104521 is about 35243.5032452791. The cubic root of 1242104521 is about 1074.9445137397.

Adding to 1242104521 its reverse (1254012421), we get a palindrome (2496116942).

The spelling of 1242104521 in words is "one billion, two hundred forty-two million, one hundred four thousand, five hundred twenty-one".