21570827863 has 16 divisors (see below), whose sum is σ = 24301319616. Its totient is φ = 18997735680.

The previous prime is 21570827849. The next prime is 21570827897. The reversal of 21570827863 is 36872807512.

It is a cyclic number.

It is not a de Polignac number, because 21570827863 - 2⁹ = 21570827351 is a prime.

It is a super-2 number, since 2×21570827863² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21570827263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27843 + ... + 209563.

It is an arithmetic number, because the mean of its divisors is an integer number (1518832476).

Almost surely, 2^21570827863 is an apocalyptic number.

21570827863 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21570827863 is a deficient number, since it is larger than the sum of its proper divisors (2730491753).

21570827863 is a wasteful number, since it uses less digits than its factorization.

21570827863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182154.

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 21570827863 in words is "twenty-one billion, five hundred seventy million, eight hundred twenty-seven thousand, eight hundred sixty-three".