21646484300 has 72 divisors (see below), whose sum is σ = 53715895296. Its totient is φ = 7417143360.

The previous prime is 21646484269. The next prime is 21646484309. The reversal of 21646484300 is 348464612.

It is not an unprimeable number, because it can be changed into a prime (21646484309) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1267619 + ... + 1284581.

Almost surely, 2^21646484300 is an apocalyptic number.

21646484300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21646484300 is an abundant number, since it is smaller than the sum of its proper divisors (32069410996).

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

21646484300 is a wasteful number, since it uses less digits than its factorization.

21646484300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18807 (or 18800 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 38.

The spelling of 21646484300 in words is "twenty-one billion, six hundred forty-six million, four hundred eighty-four thousand, three hundred".