21232021229 has 4 divisors (see below), whose sum is σ = 21264837984. Its totient is φ = 21199204476.

The previous prime is 21232021171. The next prime is 21232021231. The reversal of 21232021229 is 92212023212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21232021229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21232021198 and 21232021207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232021829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16407407 + ... + 16408700.

It is an arithmetic number, because the mean of its divisors is an integer number (5316209496).

Almost surely, 2^21232021229 is an apocalyptic number.

It is an amenable number.

21232021229 is a deficient number, since it is larger than the sum of its proper divisors (32816755).

21232021229 is an equidigital number, since it uses as much as digits as its factorization.

21232021229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32816754.

The product of its (nonzero) digits is 1728, while the sum is 26.

The spelling of 21232021229 in words is "twenty-one billion, two hundred thirty-two million, twenty-one thousand, two hundred twenty-nine".