1212321 has 16 divisors (see below), whose sum is σ = 1867968. Its totient is φ = 691200.

The previous prime is 1212319. The next prime is 1212331. The reversal of 1212321 is 1232121.

1212321 = 259² + 260² + ... + 275².

1212321 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 1212321 - 2¹ = 1212319 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 1212297 and 1212306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212301) 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, 520 + ... + 1641.

It is an arithmetic number, because the mean of its divisors is an integer number (116748).

2^1212321 is an apocalyptic number.

1212321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212321 is a deficient number, since it is larger than the sum of its proper divisors (655647).

1212321 is a wasteful number, since it uses less digits than its factorization.

1212321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2192.

The product of its digits is 24, while the sum is 12.

The square root of 1212321 is about 1101.0544945642. The cubic root of 1212321 is about 106.6283141198.

Adding to 1212321 its reverse (1232121), we get a palindrome (2444442).

It can be divided in two parts, 121 and 2321, that added together give a palindrome (2442).

The spelling of 1212321 in words is "one million, two hundred twelve thousand, three hundred twenty-one".