421350551 has 4 divisors (see below), whose sum is σ = 424141104. Its totient is φ = 418560000.

The previous prime is 421350539. The next prime is 421350557. The reversal of 421350551 is 155053124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421350551 - 2¹⁰ = 421349527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421350551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421350557) 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, 1395050 + ... + 1395351.

It is an arithmetic number, because the mean of its divisors is an integer number (106035276).

Almost surely, 2^421350551 is an apocalyptic number.

421350551 is a deficient number, since it is larger than the sum of its proper divisors (2790553).

421350551 is a wasteful number, since it uses less digits than its factorization.

421350551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2790552.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 421350551 is about 20526.8251563655. The cubic root of 421350551 is about 749.6890865356.

The spelling of 421350551 in words is "four hundred twenty-one million, three hundred fifty thousand, five hundred fifty-one".