1212042001 has 16 divisors (see below), whose sum is σ = 1261325520. Its totient is φ = 1163934720.

The previous prime is 1212041983. The next prime is 1212042049. The reversal of 1212042001 is 1002402121.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1002001 + 1211040000 = 1001^2 + 34800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212042001 - 2²³ = 1203653393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212042101) 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 15 ways as a sum of consecutive naturals, for example, 752485 + ... + 754093.

It is an arithmetic number, because the mean of its divisors is an integer number (78832845).

Almost surely, 2^1212042001 is an apocalyptic number.

1212042001 is the 28426-th pentagonal number.

It is an amenable number.

1212042001 is a deficient number, since it is larger than the sum of its proper divisors (49283519).

1212042001 is a wasteful number, since it uses less digits than its factorization.

1212042001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1956.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1212042001 is about 34814.3935894337. The cubic root of 1212042001 is about 1066.2013381236.

Adding to 1212042001 its reverse (1002402121), we get a palindrome (2214444122).

The spelling of 1212042001 in words is "one billion, two hundred twelve million, forty-two thousand, one".