21342003231 has 4 divisors (see below), whose sum is σ = 28456004312. Its totient is φ = 14228002152.

The previous prime is 21342003217. The next prime is 21342003259. The reversal of 21342003231 is 13230024312.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21342003231 - 2¹³ = 21341995039 is a prime.

It is a super-2 number, since 2×21342003231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21342003198 and 21342003207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342003281) 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, 3557000536 + ... + 3557000541.

It is an arithmetic number, because the mean of its divisors is an integer number (7114001078).

Almost surely, 2^21342003231 is an apocalyptic number.

21342003231 is a deficient number, since it is larger than the sum of its proper divisors (7114001081).

21342003231 is an equidigital number, since it uses as much as digits as its factorization.

21342003231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7114001080.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21342003231 its reverse (13230024312), we get a palindrome (34572027543).

The spelling of 21342003231 in words is "twenty-one billion, three hundred forty-two million, three thousand, two hundred thirty-one".