21423002301251 has 2 divisors, whose sum is σ = 21423002301252. Its totient is φ = 21423002301250.

The previous prime is 21423002301199. The next prime is 21423002301293. The reversal of 21423002301251 is 15210320032412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21423002301251 - 2⁶ = 21423002301187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21423002301251.

It is not a weakly prime, because it can be changed into another prime (21423002301751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711501150625 + 10711501150626.

It is an arithmetic number, because the mean of its divisors is an integer number (10711501150626).

Almost surely, 2^{21423002301251} is an apocalyptic number.

21423002301251 is a deficient number, since it is larger than the sum of its proper divisors (1).

21423002301251 is an equidigital number, since it uses as much as digits as its factorization.

21423002301251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21423002301251 its reverse (15210320032412), we get a palindrome (36633322333663).

The spelling of 21423002301251 in words is "twenty-one trillion, four hundred twenty-three billion, two million, three hundred one thousand, two hundred fifty-one".