21025401223 has 2 divisors, whose sum is σ = 21025401224. Its totient is φ = 21025401222.

The previous prime is 21025401193. The next prime is 21025401259. The reversal of 21025401223 is 32210452012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21025401223 - 2²⁵ = 20991846791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21025401194 and 21025401203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21025401283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10512700611 + 10512700612.

It is an arithmetic number, because the mean of its divisors is an integer number (10512700612).

Almost surely, 2^21025401223 is an apocalyptic number.

21025401223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21025401223 is an equidigital number, since it uses as much as digits as its factorization.

21025401223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21025401223 its reverse (32210452012), we get a palindrome (53235853235).

The spelling of 21025401223 in words is "twenty-one billion, twenty-five million, four hundred one thousand, two hundred twenty-three".