21630713542646 has 16 divisors (see below), whose sum is σ = 36461135872224. Its totient is φ = 9549345108864.

The previous prime is 21630713542643. The next prime is 21630713542651. The reversal of 21630713542646 is 64624531703612.

It is a junction number, because it is equal to n+sod(n) for n = 21630713542594 and 21630713542603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21630713542643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18085880291 + ... + 18085881486.

It is an arithmetic number, because the mean of its divisors is an integer number (2278820992014).

Almost surely, 2^{21630713542646} is an apocalyptic number.

21630713542646 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21630713542646 is a deficient number, since it is larger than the sum of its proper divisors (14830422329578).

21630713542646 is a wasteful number, since it uses less digits than its factorization.

21630713542646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36171761815.

The product of its (nonzero) digits is 4354560, while the sum is 50.

The spelling of 21630713542646 in words is "twenty-one trillion, six hundred thirty billion, seven hundred thirteen million, five hundred forty-two thousand, six hundred forty-six".