21101001011 has 8 divisors (see below), whose sum is σ = 21342612240. Its totient is φ = 20859490432.

The previous prime is 21101000993. The next prime is 21101001013. The reversal of 21101001011 is 11010010112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21101001011 - 2¹⁴ = 21100984627 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21101001011.

It is not an unprimeable number, because it can be changed into a prime (21101001013) 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, 446816 + ... + 491778.

It is an arithmetic number, because the mean of its divisors is an integer number (2667826530).

Almost surely, 2^21101001011 is an apocalyptic number.

21101001011 is a deficient number, since it is larger than the sum of its proper divisors (241611229).

21101001011 is an equidigital number, since it uses as much as digits as its factorization.

21101001011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50325.

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

Adding to 21101001011 its reverse (11010010112), we get a palindrome (32111011123).

It can be divided in two parts, 2 and 1101001011, that multiplied together give a palindrome (2202002022).

The spelling of 21101001011 in words is "twenty-one billion, one hundred one million, one thousand, eleven".