1217421 has 24 divisors (see below), whose sum is σ = 1904760. Its totient is φ = 746496.

The previous prime is 1217417. The next prime is 1217423. The reversal of 1217421 is 1247121.

It can be written as a sum of positive squares in 4 ways, for example, as 476100 + 741321 = 690^2 + 861^2 .

It is not a de Polignac number, because 1217421 - 2² = 1217417 is a prime.

It is a super-2 number, since 2×1217421² = 2964227782482, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1217394 and 1217403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11115 + ... + 11223.

It is an arithmetic number, because the mean of its divisors is an integer number (79365).

2^1217421 is an apocalyptic number.

It is an amenable number.

1217421 is a deficient number, since it is larger than the sum of its proper divisors (687339).

1217421 is a wasteful number, since it uses less digits than its factorization.

1217421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 202 counting only the distinct ones).

The product of its digits is 112, while the sum is 18.

The square root of 1217421 is about 1103.3680256379. The cubic root of 1217421 is about 106.7776265047. Note that the first 3 decimals are identical.

The spelling of 1217421 in words is "one million, two hundred seventeen thousand, four hundred twenty-one".