21363206366 has 16 divisors (see below), whose sum is σ = 34125933744. Its totient is φ = 9995159424.

The previous prime is 21363206363. The next prime is 21363206369. The reversal of 21363206366 is 66360236312.

It is an interprime number because it is at equal distance from previous prime (21363206363) and next prime (21363206369).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21363206363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1810100 + ... + 1821863.

It is an arithmetic number, because the mean of its divisors is an integer number (2132870859).

Almost surely, 2^21363206366 is an apocalyptic number.

21363206366 is a deficient number, since it is larger than the sum of its proper divisors (12762727378).

21363206366 is a wasteful number, since it uses less digits than its factorization.

21363206366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3632155.

The product of its (nonzero) digits is 139968, while the sum is 38.

The spelling of 21363206366 in words is "twenty-one billion, three hundred sixty-three million, two hundred six thousand, three hundred sixty-six".