21868046500 has 48 divisors (see below), whose sum is σ = 48076269696. Its totient is φ = 8689260000.

The previous prime is 21868046479. The next prime is 21868046521. The reversal of 21868046500 is 564086812.

It is an interprime number because it is at equal distance from previous prime (21868046479) and next prime (21868046521).

It is a super-2 number, since 2×21868046500² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 69322 + ... + 220321.

It is an arithmetic number, because the mean of its divisors is an integer number (1001588952).

Almost surely, 2^21868046500 is an apocalyptic number.

21868046500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21868046500 is an abundant number, since it is smaller than the sum of its proper divisors (26208223196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21868046500 is a wasteful number, since it uses less digits than its factorization.

21868046500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289813 (or 289801 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The spelling of 21868046500 in words is "twenty-one billion, eight hundred sixty-eight million, forty-six thousand, five hundred".