21001111010 has 32 divisors (see below), whose sum is σ = 41259627072. Its totient is φ = 7632863680.

The previous prime is 21001110967. The next prime is 21001111063. The reversal of 21001111010 is 1011110012.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 171869 + ... + 267471.

It is an arithmetic number, because the mean of its divisors is an integer number (1289363346).

Almost surely, 2^21001111010 is an apocalyptic number.

21001111010 is a deficient number, since it is larger than the sum of its proper divisors (20258516062).

21001111010 is a wasteful number, since it uses less digits than its factorization.

21001111010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97618.

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

Adding to 21001111010 its reverse (1011110012), we get a palindrome (22012221022).

The spelling of 21001111010 in words is "twenty-one billion, one million, one hundred eleven thousand, ten".