21401424223 has 2 divisors, whose sum is σ = 21401424224. Its totient is φ = 21401424222.

The previous prime is 21401424127. The next prime is 21401424241. The reversal of 21401424223 is 32242410412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21401424223 is a prime.

It is a super-2 number, since 2×21401424223² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21401424323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700712111 + 10700712112.

It is an arithmetic number, because the mean of its divisors is an integer number (10700712112).

Almost surely, 2^21401424223 is an apocalyptic number.

21401424223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21401424223 is an equidigital number, since it uses as much as digits as its factorization.

21401424223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21401424223 its reverse (32242410412), we get a palindrome (53643834635).

The spelling of 21401424223 in words is "twenty-one billion, four hundred one million, four hundred twenty-four thousand, two hundred twenty-three".