1421217 has 24 divisors (see below), whose sum is σ = 2486016. Its totient is φ = 763776.

The previous prime is 1421213. The next prime is 1421221. The reversal of 1421217 is 7121241.

It is an interprime number because it is at equal distance from previous prime (1421213) and next prime (1421221).

It is not a de Polignac number, because 1421217 - 2² = 1421213 is a prime.

It is a super-2 number, since 2×1421217² = 4039715522178, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1421217.

It is not an unprimeable number, because it can be changed into a prime (1421213) 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, 408 + ... + 1734.

It is an arithmetic number, because the mean of its divisors is an integer number (103584).

2^1421217 is an apocalyptic number.

1421217 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1421217 is a deficient number, since it is larger than the sum of its proper divisors (1064799).

1421217 is a wasteful number, since it uses less digits than its factorization.

1421217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357 (or 1354 counting only the distinct ones).

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

The square root of 1421217 is about 1192.1480612743. The cubic root of 1421217 is about 112.4311875480.

Adding to 1421217 its reverse (7121241), we get a palindrome (8542458).

The spelling of 1421217 in words is "one million, four hundred twenty-one thousand, two hundred seventeen".