421205451 has 8 divisors (see below), whose sum is σ = 567168144. Its totient is φ = 278023200.

The previous prime is 421205431. The next prime is 421205459. The reversal of 421205451 is 154502124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 421205451 - 2¹¹ = 421203403 is a prime.

It is a super-2 number, since 2×421205451² = 354828063904226802, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (421205459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 694756 + ... + 695361.

It is an arithmetic number, because the mean of its divisors is an integer number (70896018).

Almost surely, 2^421205451 is an apocalyptic number.

421205451 is a deficient number, since it is larger than the sum of its proper divisors (145962693).

421205451 is a wasteful number, since it uses less digits than its factorization.

421205451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390221.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 421205451 is about 20523.2904525566. The cubic root of 421205451 is about 749.6030201353.

Adding to 421205451 its reverse (154502124), we get a palindrome (575707575).

The spelling of 421205451 in words is "four hundred twenty-one million, two hundred five thousand, four hundred fifty-one".