21011101010 has 16 divisors (see below), whose sum is σ = 38173441536. Its totient is φ = 8325893808.

The previous prime is 21011101009. The next prime is 21011101103. The reversal of 21011101010 is 1010111012.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9817202 + ... + 9819341.

It is an arithmetic number, because the mean of its divisors is an integer number (2385840096).

Almost surely, 2^21011101010 is an apocalyptic number.

21011101010 is a deficient number, since it is larger than the sum of its proper divisors (17162340526).

21011101010 is a wasteful number, since it uses less digits than its factorization.

21011101010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19636657.

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

Adding to 21011101010 its reverse (1010111012), we get a palindrome (22021212022).

The spelling of 21011101010 in words is "twenty-one billion, eleven million, one hundred one thousand, ten".