21421343023 has 2 divisors, whose sum is σ = 21421343024. Its totient is φ = 21421343022.

The previous prime is 21421342973. The next prime is 21421343101. The reversal of 21421343023 is 32034312412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21421343023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21421343623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710671511 + 10710671512.

It is an arithmetic number, because the mean of its divisors is an integer number (10710671512).

Almost surely, 2^21421343023 is an apocalyptic number.

21421343023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21421343023 is an equidigital number, since it uses as much as digits as its factorization.

21421343023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21421343023 its reverse (32034312412), we get a palindrome (53455655435).

The spelling of 21421343023 in words is "twenty-one billion, four hundred twenty-one million, three hundred forty-three thousand, twenty-three".