11021210021 has 4 divisors (see below), whose sum is σ = 11021581344. Its totient is φ = 11020838700.

The previous prime is 11021209999. The next prime is 11021210023. The reversal of 11021210021 is 12001212011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12001212011 = 257 ⋅46697323.

It is a cyclic number.

It is not a de Polignac number, because 11021210021 - 2¹⁸ = 11020947877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11021209984 and 11021210011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021210023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136865 + ... + 201926.

It is an arithmetic number, because the mean of its divisors is an integer number (2755395336).

Almost surely, 2^11021210021 is an apocalyptic number.

It is an amenable number.

11021210021 is a deficient number, since it is larger than the sum of its proper divisors (371323).

11021210021 is an equidigital number, since it uses as much as digits as its factorization.

11021210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371322.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 11021210021 its reverse (12001212011), we get a palindrome (23022422032).

The spelling of 11021210021 in words is "eleven billion, twenty-one million, two hundred ten thousand, twenty-one".