21210011300 has 72 divisors (see below), whose sum is σ = 48265530600. Its totient is φ = 8079160320.

The previous prime is 21210011297. The next prime is 21210011371. The reversal of 21210011300 is 311001212.

It can be written as a sum of positive squares in 12 ways, for example, as 8029593664 + 13180417636 = 89608^2 + 114806^2 .

It is a super-2 number, since 2×21210011300² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 161606 + ... + 261794.

Almost surely, 2^21210011300 is an apocalyptic number.

21210011300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210011300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24132765300).

21210011300 is an abundant number, since it is smaller than the sum of its proper divisors (27055519300).

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

21210011300 is a wasteful number, since it uses less digits than its factorization.

21210011300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100305 (or 100298 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21210011300 its reverse (311001212), we get a palindrome (21521012512).

The spelling of 21210011300 in words is "twenty-one billion, two hundred ten million, eleven thousand, three hundred".