21145402463 has 2 divisors, whose sum is σ = 21145402464. Its totient is φ = 21145402462.

The previous prime is 21145402441. The next prime is 21145402469. The reversal of 21145402463 is 36420454112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21145402463 - 2¹⁸ = 21145140319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21145402469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572701231 + 10572701232.

It is an arithmetic number, because the mean of its divisors is an integer number (10572701232).

Almost surely, 2^21145402463 is an apocalyptic number.

21145402463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21145402463 is an equidigital number, since it uses as much as digits as its factorization.

21145402463 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 32.

Adding to 21145402463 its reverse (36420454112), we get a palindrome (57565856575).

The spelling of 21145402463 in words is "twenty-one billion, one hundred forty-five million, four hundred two thousand, four hundred sixty-three".