21201010000 has 50 divisors (see below), whose sum is σ = 51329789522. Its totient is φ = 8480400000.

The previous prime is 21201009997. The next prime is 21201010003. The reversal of 21201010000 is 1010212.

It is an interprime number because it is at equal distance from previous prime (21201009997) and next prime (21201010003).

It can be written as a sum of positive squares in 5 ways, for example, as 10681635904 + 10519374096 = 103352^2 + 102564^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201010003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1050051 + ... + 1070050.

Almost surely, 2^21201010000 is an apocalyptic number.

21201010000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201010000 is an abundant number, since it is smaller than the sum of its proper divisors (30128779522).

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

21201010000 is an equidigital number, since it uses as much as digits as its factorization.

21201010000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120129 (or 2120108 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21201010000 its reverse (1010212), we get a palindrome (21202020212).

The spelling of 21201010000 in words is "twenty-one billion, two hundred one million, ten thousand".