451421021 has 4 divisors (see below), whose sum is σ = 451846752. Its totient is φ = 450995292.

The previous prime is 451421011. The next prime is 451421027. The reversal of 451421021 is 120124154.

It is a happy number.

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 451421021 - 2¹⁴ = 451404637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 451420984 and 451421002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451421027) 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, 211271 + ... + 213396.

It is an arithmetic number, because the mean of its divisors is an integer number (112961688).

Almost surely, 2^451421021 is an apocalyptic number.

It is an amenable number.

451421021 is a deficient number, since it is larger than the sum of its proper divisors (425731).

451421021 is a wasteful number, since it uses less digits than its factorization.

451421021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425730.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 451421021 is about 21246.6708215664. The cubic root of 451421021 is about 767.1152083740.

Adding to 451421021 its reverse (120124154), we get a palindrome (571545175).

The spelling of 451421021 in words is "four hundred fifty-one million, four hundred twenty-one thousand, twenty-one".