21670210000 has 50 divisors (see below), whose sum is σ = 52465769642. Its totient is φ = 8668080000.

The previous prime is 21670209997. The next prime is 21670210021. The reversal of 21670210000 is 1207612.

It can be written as a sum of positive squares in 5 ways, for example, as 16133064256 + 5537145744 = 127016^2 + 74412^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is a self number, because there is not a number n which added to its sum of digits gives 21670210000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1073511 + ... + 1093510.

Almost surely, 2^21670210000 is an apocalyptic number.

21670210000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21670210000 is an abundant number, since it is smaller than the sum of its proper divisors (30795559642).

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

21670210000 is an equidigital number, since it uses as much as digits as its factorization.

21670210000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2167049 (or 2167028 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

Adding to 21670210000 its reverse (1207612), we get a palindrome (21671417612).

The spelling of 21670210000 in words is "twenty-one billion, six hundred seventy million, two hundred ten thousand".