21011011010 has 64 divisors (see below), whose sum is σ = 42084178560. Its totient is φ = 7490367040.

The previous prime is 21011010973. The next prime is 21011011033. The reversal of 21011011010 is 1011011012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16375829 + ... + 16377111.

It is an arithmetic number, because the mean of its divisors is an integer number (657565290).

Almost surely, 2^21011011010 is an apocalyptic number.

21011011010 is an abundant number, since it is smaller than the sum of its proper divisors (21073167550).

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

21011011010 is an equidigital number, since it uses as much as digits as its factorization.

21011011010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460 (or 1354 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 21011011010 its reverse (1011011012), we get a palindrome (22022022022).

The spelling of 21011011010 in words is "twenty-one billion, eleven million, eleven thousand, ten".