21011061010 has 16 divisors (see below), whose sum is σ = 38028862872. Its totient is φ = 8357990400.

The previous prime is 21011060951. The next prime is 21011061017. The reversal of 21011061010 is 1016011012.

It can be written as a sum of positive squares in 4 ways, for example, as 10570512969 + 10440548041 = 102813^2 + 102179^2 .

It is not an unprimeable number, because it can be changed into a prime (21011061017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5802351 + ... + 5805970.

Almost surely, 2^21011061010 is an apocalyptic number.

21011061010 is a deficient number, since it is larger than the sum of its proper divisors (17017801862).

21011061010 is a wasteful number, since it uses less digits than its factorization.

21011061010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11608509.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21011061010 its reverse (1016011012), we get a palindrome (22027072022).

The spelling of 21011061010 in words is "twenty-one billion, eleven million, sixty-one thousand, ten".