21223004012351 has 2 divisors, whose sum is σ = 21223004012352. Its totient is φ = 21223004012350.

The previous prime is 21223004012267. The next prime is 21223004012381. The reversal of 21223004012351 is 15321040032212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21223004012351 - 2¹⁰ = 21223004011327 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21223004012351.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21223004012381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611502006175 + 10611502006176.

It is an arithmetic number, because the mean of its divisors is an integer number (10611502006176).

Almost surely, 2^{21223004012351} is an apocalyptic number.

21223004012351 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223004012351 is an equidigital number, since it uses as much as digits as its factorization.

21223004012351 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 21223004012351 its reverse (15321040032212), we get a palindrome (36544044044563).

The spelling of 21223004012351 in words is "twenty-one trillion, two hundred twenty-three billion, four million, twelve thousand, three hundred fifty-one".