21013026210 has 64 divisors (see below), whose sum is σ = 61128812160. Its totient is φ = 5094066240.

The previous prime is 21013026187. The next prime is 21013026211. The reversal of 21013026210 is 1262031012.

21013026210 is a `hidden beast` number, since 2 + 10 + 1 + 30 + 2 + 621 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21013026211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3534577 + ... + 3540516.

It is an arithmetic number, because the mean of its divisors is an integer number (955137690).

Almost surely, 2^21013026210 is an apocalyptic number.

21013026210 is an abundant number, since it is smaller than the sum of its proper divisors (40115785950).

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

21013026210 is a wasteful number, since it uses less digits than its factorization.

21013026210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7075120 (or 7075114 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21013026210 its reverse (1262031012), we get a palindrome (22275057222).

The spelling of 21013026210 in words is "twenty-one billion, thirteen million, twenty-six thousand, two hundred ten".