1211520242 has 16 divisors (see below), whose sum is σ = 1833022464. Its totient is φ = 600534000.

The previous prime is 1211520241. The next prime is 1211520257. The reversal of 1211520242 is 2420251121.

It is not an unprimeable number, because it can be changed into a prime (1211520241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114767 + ... + 124877.

It is an arithmetic number, because the mean of its divisors is an integer number (114563904).

Almost surely, 2^1211520242 is an apocalyptic number.

1211520242 is a deficient number, since it is larger than the sum of its proper divisors (621502222).

1211520242 is a wasteful number, since it uses less digits than its factorization.

1211520242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10625.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1211520242 is about 34806.8993448138. The cubic root of 1211520242 is about 1066.0483236275.

Adding to 1211520242 its reverse (2420251121), we get a palindrome (3631771363).

The spelling of 1211520242 in words is "one billion, two hundred eleven million, five hundred twenty thousand, two hundred forty-two".