1212123001 has 16 divisors (see below), whose sum is σ = 1315315584. Its totient is φ = 1112557824.

The previous prime is 1212122999. The next prime is 1212123007. The reversal of 1212123001 is 1003212121.

It is a cyclic number.

It is not a de Polignac number, because 1212123001 - 2¹ = 1212122999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212123007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 886020 + ... + 887386.

It is an arithmetic number, because the mean of its divisors is an integer number (82207224).

Almost surely, 2^1212123001 is an apocalyptic number.

It is an amenable number.

1212123001 is a deficient number, since it is larger than the sum of its proper divisors (103192583).

1212123001 is a wasteful number, since it uses less digits than its factorization.

1212123001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1212123001 is about 34815.5568819457. The cubic root of 1212123001 is about 1066.2250887815.

Adding to 1212123001 its reverse (1003212121), we get a palindrome (2215335122).

The spelling of 1212123001 in words is "one billion, two hundred twelve million, one hundred twenty-three thousand, one".