21180663086 has 32 divisors (see below), whose sum is σ = 36816249600. Its totient is φ = 9032060800.

The previous prime is 21180663083. The next prime is 21180663089. The reversal of 21180663086 is 68036608112.

It is an interprime number because it is at equal distance from previous prime (21180663083) and next prime (21180663089).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21180663083) 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, 25265 + ... + 207363.

It is an arithmetic number, because the mean of its divisors is an integer number (1150507800).

Almost surely, 2^21180663086 is an apocalyptic number.

21180663086 is a deficient number, since it is larger than the sum of its proper divisors (15635586514).

21180663086 is a wasteful number, since it uses less digits than its factorization.

21180663086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182440.

The product of its (nonzero) digits is 82944, while the sum is 41.

The spelling of 21180663086 in words is "twenty-one billion, one hundred eighty million, six hundred sixty-three thousand, eighty-six".