8401421 has 8 divisors (see below), whose sum is σ = 9637824. Its totient is φ = 7174080.

The previous prime is 8401411. The next prime is 8401427. The reversal of 8401421 is 1241048.

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 8401421 - 2⁶ = 8401357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8401393 and 8401402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8401427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140 + ... + 4101.

It is an arithmetic number, because the mean of its divisors is an integer number (1204728).

Almost surely, 2^8401421 is an apocalyptic number.

It is an amenable number.

8401421 is a deficient number, since it is larger than the sum of its proper divisors (1236403).

8401421 is a wasteful number, since it uses less digits than its factorization.

8401421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4531.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 8401421 is about 2898.5204846611. The cubic root of 8401421 is about 203.2907334089.

Adding to 8401421 its reverse (1241048), we get a palindrome (9642469).

The spelling of 8401421 in words is "eight million, four hundred one thousand, four hundred twenty-one".