1210421 has 4 divisors (see below), whose sum is σ = 1263072. Its totient is φ = 1157772.

The previous prime is 1210411. The next prime is 1210427. The reversal of 1210421 is 1240121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1240121 = 59 ⋅21019.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1210421 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 (1210427) 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, 26291 + ... + 26336.

It is an arithmetic number, because the mean of its divisors is an integer number (315768).

2^1210421 is an apocalyptic number.

It is an amenable number.

1210421 is a deficient number, since it is larger than the sum of its proper divisors (52651).

1210421 is an equidigital number, since it uses as much as digits as its factorization.

1210421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52650.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1210421 is about 1100.1913469938. The cubic root of 1210421 is about 106.5725808811.

Adding to 1210421 its reverse (1240121), we get a palindrome (2450542).

The spelling of 1210421 in words is "one million, two hundred ten thousand, four hundred twenty-one".