21202013231 has 8 divisors (see below), whose sum is σ = 24253935744. Its totient is φ = 18155856600.

The previous prime is 21202013219. The next prime is 21202013291. The reversal of 21202013231 is 13231020212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21202013231 - 2¹⁰ = 21202012207 is a prime.

It is a super-2 number, since 2×21202013231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202013291) 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, 1433585 + ... + 1448298.

It is an arithmetic number, because the mean of its divisors is an integer number (3031741968).

Almost surely, 2^21202013231 is an apocalyptic number.

21202013231 is a deficient number, since it is larger than the sum of its proper divisors (3051922513).

21202013231 is a wasteful number, since it uses less digits than its factorization.

21202013231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2882941.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21202013231 its reverse (13231020212), we get a palindrome (34433033443).

The spelling of 21202013231 in words is "twenty-one billion, two hundred two million, thirteen thousand, two hundred thirty-one".