11021010021 has 48 divisors (see below), whose sum is σ = 19166118400. Its totient is φ = 5961540384.

The previous prime is 11021009969. The next prime is 11021010109. The reversal of 11021010021 is 12001012011.

It is a happy number.

It is not a de Polignac number, because 11021010021 - 2¹³ = 11021001829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11021009985 and 11021010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021010421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1944690 + ... + 1950348.

Almost surely, 2^11021010021 is an apocalyptic number.

It is an amenable number.

11021010021 is a deficient number, since it is larger than the sum of its proper divisors (8145108379).

11021010021 is a wasteful number, since it uses less digits than its factorization.

11021010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7318 (or 7315 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 11021010021 its reverse (12001012011), we get a palindrome (23022022032).

The spelling of 11021010021 in words is "eleven billion, twenty-one million, ten thousand, twenty-one".