6421102421 has 16 divisors (see below), whose sum is σ = 6831682560. Its totient is φ = 6017946480.

The previous prime is 6421102417. The next prime is 6421102439. The reversal of 6421102421 is 1242011246.

It is a cyclic number.

It is not a de Polignac number, because 6421102421 - 2² = 6421102417 is a prime.

It is a super-2 number, since 2×6421102421² = 82461112601944122482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421105421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1850330 + ... + 1853796.

It is an arithmetic number, because the mean of its divisors is an integer number (426980160).

Almost surely, 2^6421102421 is an apocalyptic number.

It is an amenable number.

6421102421 is a deficient number, since it is larger than the sum of its proper divisors (410580139).

6421102421 is a wasteful number, since it uses less digits than its factorization.

6421102421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4504.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 6421102421 is about 80131.7815913262. The cubic root of 6421102421 is about 1858.6738939552.

Adding to 6421102421 its reverse (1242011246), we get a palindrome (7663113667).

The spelling of 6421102421 in words is "six billion, four hundred twenty-one million, one hundred two thousand, four hundred twenty-one".