1212321407 has 4 divisors (see below), whose sum is σ = 1322532456. Its totient is φ = 1102110360.

The previous prime is 1212321401. The next prime is 1212321419. The reversal of 1212321407 is 7041232121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1212321407 - 2²⁴ = 1195544191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212321401) 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, 55105508 + ... + 55105529.

It is an arithmetic number, because the mean of its divisors is an integer number (330633114).

Almost surely, 2^1212321407 is an apocalyptic number.

1212321407 is a deficient number, since it is larger than the sum of its proper divisors (110211049).

1212321407 is a wasteful number, since it uses less digits than its factorization.

1212321407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110211048.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1212321407 is about 34818.4061524935. The cubic root of 1212321407 is about 1066.2832605219.

Adding to 1212321407 its reverse (7041232121), we get a palindrome (8253553528).

The spelling of 1212321407 in words is "one billion, two hundred twelve million, three hundred twenty-one thousand, four hundred seven".