21428134841 has 8 divisors (see below), whose sum is σ = 21464277120. Its totient is φ = 21392018928.

The previous prime is 21428134801. The next prime is 21428134873. The reversal of 21428134841 is 14843182412.

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 21428134841 - 2¹⁰ = 21428133817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21428134795 and 21428134804.

It is not an unprimeable number, because it can be changed into a prime (21428134801) 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, 2209040 + ... + 2218718.

It is an arithmetic number, because the mean of its divisors is an integer number (2683034640).

Almost surely, 2^21428134841 is an apocalyptic number.

It is an amenable number.

21428134841 is a deficient number, since it is larger than the sum of its proper divisors (36142279).

21428134841 is an equidigital number, since it uses as much as digits as its factorization.

21428134841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13183.

The product of its digits is 49152, while the sum is 38.

The spelling of 21428134841 in words is "twenty-one billion, four hundred twenty-eight million, one hundred thirty-four thousand, eight hundred forty-one".