2211212021 has 8 divisors (see below), whose sum is σ = 2237619384. Its totient is φ = 2184960960.

The previous prime is 2211211949. The next prime is 2211212023. The reversal of 2211212021 is 1202121122.

It can be written as a sum of positive squares in 4 ways, for example, as 141871921 + 2069340100 = 11911^2 + 45490^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2211212021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2211211987 and 2211212005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211212023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10490 + ... + 67323.

It is an arithmetic number, because the mean of its divisors is an integer number (279702423).

Almost surely, 2^2211212021 is an apocalyptic number.

It is an amenable number.

2211212021 is a deficient number, since it is larger than the sum of its proper divisors (26407363).

2211212021 is a wasteful number, since it uses less digits than its factorization.

2211212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78151.

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

The square root of 2211212021 is about 47023.5262501655. The cubic root of 2211212021 is about 1302.7971372006.

Adding to 2211212021 its reverse (1202121122), we get a palindrome (3413333143).

The spelling of 2211212021 in words is "two billion, two hundred eleven million, two hundred twelve thousand, twenty-one".