421322551 has 8 divisors (see below), whose sum is σ = 454934480. Its totient is φ = 387882432.

The previous prime is 421322513. The next prime is 421322609. The reversal of 421322551 is 155223124.

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

It is a cyclic number.

It is not a de Polignac number, because 421322551 - 2²¹ = 419225399 is a prime.

It is a super-2 number, since 2×421322551² = 355025383962295202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421322501) 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, 37830 + ... + 47683.

It is an arithmetic number, because the mean of its divisors is an integer number (56866810).

Almost surely, 2^421322551 is an apocalyptic number.

421322551 is a deficient number, since it is larger than the sum of its proper divisors (33611929).

421322551 is a wasteful number, since it uses less digits than its factorization.

421322551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85905.

The product of its digits is 2400, while the sum is 25.

The square root of 421322551 is about 20526.1431106772. The cubic root of 421322551 is about 749.6724798097.

Adding to 421322551 its reverse (155223124), we get a palindrome (576545675).

The spelling of 421322551 in words is "four hundred twenty-one million, three hundred twenty-two thousand, five hundred fifty-one".