11222012021 has 12 divisors (see below), whose sum is σ = 12337598700. Its totient is φ = 10199629440.

The previous prime is 11222012017. The next prime is 11222012023. The reversal of 11222012021 is 12021022211.

It can be written as a sum of positive squares in 2 ways, for example, as 2906395921 + 8315616100 = 53911^2 + 91190^2 .

It is not a de Polignac number, because 11222012021 - 2² = 11222012017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11222011987 and 11222012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11222012023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 878045 + ... + 890733.

It is an arithmetic number, because the mean of its divisors is an integer number (1028133225).

Almost surely, 2^11222012021 is an apocalyptic number.

11222012021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11222012021 is a deficient number, since it is larger than the sum of its proper divisors (1115586679).

11222012021 is a wasteful number, since it uses less digits than its factorization.

11222012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20020 (or 20009 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 11222012021 its reverse (12021022211), we get a palindrome (23243034232).

The spelling of 11222012021 in words is "eleven billion, two hundred twenty-two million, twelve thousand, twenty-one".