1222011021 has 32 divisors (see below), whose sum is σ = 2059250688. Its totient is φ = 626106240.

The previous prime is 1222011013. The next prime is 1222011031. The reversal of 1222011021 is 1201102221.

It is not a de Polignac number, because 1222011021 - 2³ = 1222011013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1222010988 and 1222011006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222011031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19371 + ... + 53096.

It is an arithmetic number, because the mean of its divisors is an integer number (64351584).

Almost surely, 2^1222011021 is an apocalyptic number.

1222011021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1222011021 is a deficient number, since it is larger than the sum of its proper divisors (837239667).

1222011021 is a wasteful number, since it uses less digits than its factorization.

1222011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72561.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1222011021 is about 34957.2742215408. The cubic root of 1222011021 is about 1069.1165214354.

Adding to 1222011021 its reverse (1201102221), we get a palindrome (2423113242).

The spelling of 1222011021 in words is "one billion, two hundred twenty-two million, eleven thousand, twenty-one".