11012120021 has 16 divisors (see below), whose sum is σ = 13135972608. Its totient is φ = 9026160000.

The previous prime is 11012119967. The next prime is 11012120023. The reversal of 11012120021 is 12002121011.

It is a cyclic number.

It is not a de Polignac number, because 11012120021 - 2¹⁸ = 11011857877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11012119984 and 11012120011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11012120023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 840521 + ... + 853521.

It is an arithmetic number, because the mean of its divisors is an integer number (820998288).

Almost surely, 2^11012120021 is an apocalyptic number.

It is an amenable number.

11012120021 is a deficient number, since it is larger than the sum of its proper divisors (2123852587).

11012120021 is a wasteful number, since it uses less digits than its factorization.

11012120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18292.

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

Adding to 11012120021 its reverse (12002121011), we get a palindrome (23014241032).

The spelling of 11012120021 in words is "eleven billion, twelve million, one hundred twenty thousand, twenty-one".