21563704701 has 48 divisors (see below), whose sum is σ = 38848887168. Its totient is φ = 11197440000.

The previous prime is 21563704661. The next prime is 21563704703. The reversal of 21563704701 is 10740736512.

It is a happy number.

21563704701 is a `hidden beast` number, since 2 + 15 + 637 + 0 + 4 + 7 + 0 + 1 = 666.

It is not a de Polignac number, because 21563704701 - 2⁷ = 21563704573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21563704703) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2391201 + ... + 2400201.

It is an arithmetic number, because the mean of its divisors is an integer number (809351816).

Almost surely, 2^21563704701 is an apocalyptic number.

21563704701 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21563704701 is a deficient number, since it is larger than the sum of its proper divisors (17285182467).

21563704701 is a wasteful number, since it uses less digits than its factorization.

21563704701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12482 (or 12479 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The spelling of 21563704701 in words is "twenty-one billion, five hundred sixty-three million, seven hundred four thousand, seven hundred one".