21132100321 has 8 divisors (see below), whose sum is σ = 21718043424. Its totient is φ = 20549515680.

The previous prime is 21132100313. The next prime is 21132100351. The reversal of 21132100321 is 12300123112.

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 21132100321 - 2³ = 21132100313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21132100295 and 21132100304.

It is not an unprimeable number, because it can be changed into a prime (21132100351) 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, 826855 + ... + 852028.

It is an arithmetic number, because the mean of its divisors is an integer number (2714755428).

Almost surely, 2^21132100321 is an apocalyptic number.

It is an amenable number.

21132100321 is a deficient number, since it is larger than the sum of its proper divisors (585943103).

21132100321 is a wasteful number, since it uses less digits than its factorization.

21132100321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679231.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21132100321 its reverse (12300123112), we get a palindrome (33432223433).

The spelling of 21132100321 in words is "twenty-one billion, one hundred thirty-two million, one hundred thousand, three hundred twenty-one".