1051421 has 4 divisors (see below), whose sum is σ = 1201632. Its totient is φ = 901212.

The previous prime is 1051417. The next prime is 1051423. The reversal of 1051421 is 1241501.

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: 1241501 = 353 ⋅3517.

It is a cyclic number.

It is not a de Polignac number, because 1051421 - 2² = 1051417 is a prime.

It is a super-2 number, since 2×1051421² = 2210972238482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1051396 and 1051405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051423) 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, 75095 + ... + 75108.

It is an arithmetic number, because the mean of its divisors is an integer number (300408).

2^1051421 is an apocalyptic number.

It is an amenable number.

1051421 is a deficient number, since it is larger than the sum of its proper divisors (150211).

1051421 is an equidigital number, since it uses as much as digits as its factorization.

1051421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150210.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 1051421 is about 1025.3882191638. The cubic root of 1051421 is about 101.6854657822.

Adding to 1051421 its reverse (1241501), we get a palindrome (2292922).

The spelling of 1051421 in words is "one million, fifty-one thousand, four hundred twenty-one".