21002011010 has 16 divisors (see below), whose sum is σ = 38012482872. Its totient is φ = 8354390400.

The previous prime is 21002011007. The next prime is 21002011049. The reversal of 21002011010 is 1011020012.

It can be written as a sum of positive squares in 4 ways, for example, as 11868577249 + 9133433761 = 108943^2 + 95569^2 .

It is a super-2 number, since 2×21002011010² (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 7 ways as a sum of consecutive naturals, for example, 5799851 + ... + 5803470.

Almost surely, 2^21002011010 is an apocalyptic number.

21002011010 is a deficient number, since it is larger than the sum of its proper divisors (17010471862).

21002011010 is a wasteful number, since it uses less digits than its factorization.

21002011010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11603509.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21002011010 its reverse (1011020012), we get a palindrome (22013031022).

The spelling of 21002011010 in words is "twenty-one billion, two million, eleven thousand, ten".