21201042321 has 12 divisors (see below), whose sum is σ = 31611590400. Its totient is φ = 13678091640.

The previous prime is 21201042311. The next prime is 21201042337. The reversal of 21201042321 is 12324010212.

It is a happy number.

21201042321 is a `hidden beast` number, since 21 + 201 + 0 + 423 + 21 = 666.

It is not a de Polignac number, because 21201042321 - 2⁶ = 21201042257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21201042294 and 21201042303.

It is not an unprimeable number, because it can be changed into a prime (21201042311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37994421 + ... + 37994978.

It is an arithmetic number, because the mean of its divisors is an integer number (2634299200).

Almost surely, 2^21201042321 is an apocalyptic number.

It is an amenable number.

21201042321 is a deficient number, since it is larger than the sum of its proper divisors (10410548079).

21201042321 is a wasteful number, since it uses less digits than its factorization.

21201042321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75989436 (or 75989433 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21201042321 its reverse (12324010212), we get a palindrome (33525052533).

The spelling of 21201042321 in words is "twenty-one billion, two hundred one million, forty-two thousand, three hundred twenty-one".