21021422323 has 6 divisors (see below), whose sum is σ = 23106191612. Its totient is φ = 19110383820.

The previous prime is 21021422249. The next prime is 21021422339. The reversal of 21021422323 is 32322412012.

It is a de Polignac number, because none of the positive numbers 2^k-21021422323 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21021422294 and 21021422303.

It is not an unprimeable number, because it can be changed into a prime (21021422393) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 86865261 + ... + 86865502.

Almost surely, 2^21021422323 is an apocalyptic number.

21021422323 is a deficient number, since it is larger than the sum of its proper divisors (2084769289).

21021422323 is a wasteful number, since it uses less digits than its factorization.

21021422323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173730785 (or 173730774 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21021422323 its reverse (32322412012), we get a palindrome (53343834335).

It can be divided in two parts, 21021 and 422323, that added together give a palindrome (443344).

The spelling of 21021422323 in words is "twenty-one billion, twenty-one million, four hundred twenty-two thousand, three hundred twenty-three".