1021421 has 4 divisors (see below), whose sum is σ = 1075200. Its totient is φ = 967644.

The previous prime is 1021417. The next prime is 1021429. The reversal of 1021421 is 1241201.

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.

It is a cyclic number.

It is not a de Polignac number, because 1021421 - 2² = 1021417 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021429) 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, 26861 + ... + 26898.

It is an arithmetic number, because the mean of its divisors is an integer number (268800).

2^1021421 is an apocalyptic number.

It is an amenable number.

1021421 is a deficient number, since it is larger than the sum of its proper divisors (53779).

1021421 is an equidigital number, since it uses as much as digits as its factorization.

1021421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53778.

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

The square root of 1021421 is about 1010.6537488181. The cubic root of 1021421 is about 100.7089947185.

Adding to 1021421 its reverse (1241201), we get a palindrome (2262622).

The spelling of 1021421 in words is "one million, twenty-one thousand, four hundred twenty-one".