21010010010 has 32 divisors (see below), whose sum is σ = 55008027072. Its totient is φ = 5093335680.

The previous prime is 21010009991. The next prime is 21010010011. The reversal of 21010010010 is 1001001012.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is not an unprimeable number, because it can be changed into a prime (21010010011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31833019 + ... + 31833678.

It is an arithmetic number, because the mean of its divisors is an integer number (1719000846).

Almost surely, 2^21010010010 is an apocalyptic number.

21010010010 is an abundant number, since it is smaller than the sum of its proper divisors (33998017062).

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

21010010010 is a wasteful number, since it uses less digits than its factorization.

21010010010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63666718.

The product of its (nonzero) digits is 2, while the sum is 6.

Adding to 21010010010 its reverse (1001001012), we get a palindrome (22011011022).

The spelling of 21010010010 in words is "twenty-one billion, ten million, ten thousand, ten".