21802463 has 2 divisors, whose sum is σ = 21802464. Its totient is φ = 21802462.

The previous prime is 21802457. The next prime is 21802513. The reversal of 21802463 is 36420812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21802463 - 2¹² = 21798367 is a prime.

It is equal to p_1377512 and since 21802463 and 1377512 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21802453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10901231 + 10901232.

It is an arithmetic number, because the mean of its divisors is an integer number (10901232).

Almost surely, 2^21802463 is an apocalyptic number.

21802463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21802463 is an equidigital number, since it uses as much as digits as its factorization.

21802463 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 21802463 is about 4669.3107628428. The cubic root of 21802463 is about 279.3627642879.

The spelling of 21802463 in words is "twenty-one million, eight hundred two thousand, four hundred sixty-three".