21053133421 has 8 divisors (see below), whose sum is σ = 23260751424. Its totient is φ = 18953204160.

The previous prime is 21053133401. The next prime is 21053133463. The reversal of 21053133421 is 12433135012.

It is a happy number.

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 21053133421 - 2¹⁷ = 21053002349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21053133401) 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, 26921775 + ... + 26922556.

It is an arithmetic number, because the mean of its divisors is an integer number (2907593928).

Almost surely, 2^21053133421 is an apocalyptic number.

It is an amenable number.

21053133421 is a deficient number, since it is larger than the sum of its proper divisors (2207618003).

21053133421 is a wasteful number, since it uses less digits than its factorization.

21053133421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53844371.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 21053133421 its reverse (12433135012), we get a palindrome (33486268433).

The spelling of 21053133421 in words is "twenty-one billion, fifty-three million, one hundred thirty-three thousand, four hundred twenty-one".