11010021021 has 6 divisors (see below), whose sum is σ = 15903363710. Its totient is φ = 7340014008.

The previous prime is 11010021019. The next prime is 11010021023. The reversal of 11010021021 is 12012001011.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11010021019) and next prime (11010021023).

It can be written as a sum of positive squares in only one way, i.e., 10733996025 + 276024996 = 103605^2 + 16614^2 .

It is not a de Polignac number, because 11010021021 - 2¹ = 11010021019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 1223335669 = 11010021021 / (1 + 1 + 0 + 1 + 0 + 0 + 2 + 1 + 0 + 2 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11010020994 and 11010021012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11010021023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 611667826 + ... + 611667843.

Almost surely, 2^11010021021 is an apocalyptic number.

It is an amenable number.

11010021021 is a deficient number, since it is larger than the sum of its proper divisors (4893342689).

11010021021 is a wasteful number, since it uses less digits than its factorization.

11010021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223335675 (or 1223335672 counting only the distinct ones).

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

Adding to 11010021021 its reverse (12012001011), we get a palindrome (23022022032).

The spelling of 11010021021 in words is "eleven billion, ten million, twenty-one thousand, twenty-one".