1421111 has 4 divisors (see below), whose sum is σ = 1425912. Its totient is φ = 1416312.

The previous prime is 1421099. The next prime is 1421113. The reversal of 1421111 is 1111241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1111241 = 683 ⋅1627.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1421111 is a prime.

It is a Duffinian number.

1421111 is a modest number, since divided by 1111 gives 142 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1421092 and 1421101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421113) 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, 1925 + ... + 2558.

It is an arithmetic number, because the mean of its divisors is an integer number (356478).

2^1421111 is an apocalyptic number.

1421111 is a deficient number, since it is larger than the sum of its proper divisors (4801).

1421111 is an equidigital number, since it uses as much as digits as its factorization.

1421111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4800.

The product of its digits is 8, while the sum is 11.

The square root of 1421111 is about 1192.1036028802. The cubic root of 1421111 is about 112.4283922905.

Adding to 1421111 its reverse (1111241), we get a palindrome (2532352).

The spelling of 1421111 in words is "one million, four hundred twenty-one thousand, one hundred eleven".