11213020021 has 16 divisors (see below), whose sum is σ = 13721166720. Its totient is φ = 8944151040.

The previous prime is 11213020019. The next prime is 11213020127. The reversal of 11213020021 is 12002031211.

It is a cyclic number.

It is not a de Polignac number, because 11213020021 - 2¹ = 11213020019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11213019983 and 11213020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11213020321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 518775 + ... + 539956.

It is an arithmetic number, because the mean of its divisors is an integer number (857572920).

Almost surely, 2^11213020021 is an apocalyptic number.

It is an amenable number.

11213020021 is a deficient number, since it is larger than the sum of its proper divisors (2508146699).

11213020021 is a wasteful number, since it uses less digits than its factorization.

11213020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058844.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 11213020021 its reverse (12002031211), we get a palindrome (23215051232).

The spelling of 11213020021 in words is "eleven billion, two hundred thirteen million, twenty thousand, twenty-one".