421402551 has 8 divisors (see below), whose sum is σ = 575574384. Its totient is φ = 274082880.

The previous prime is 421402549. The next prime is 421402589. The reversal of 421402551 is 155204124.

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

It is not a de Polignac number, because 421402551 - 2¹ = 421402549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (441402551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1712896 + ... + 1713141.

It is an arithmetic number, because the mean of its divisors is an integer number (71946798).

Almost surely, 2^421402551 is an apocalyptic number.

421402551 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

421402551 is a deficient number, since it is larger than the sum of its proper divisors (154171833).

421402551 is a wasteful number, since it uses less digits than its factorization.

421402551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3426081.

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

The square root of 421402551 is about 20528.0917525229. The cubic root of 421402551 is about 749.7199256464.

Adding to 421402551 its reverse (155204124), we get a palindrome (576606675).

The spelling of 421402551 in words is "four hundred twenty-one million, four hundred two thousand, five hundred fifty-one".