2112223021 has 4 divisors (see below), whose sum is σ = 2236471452. Its totient is φ = 1987974592.

The previous prime is 2112222997. The next prime is 2112223063. The reversal of 2112223021 is 1203222112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1884514921 + 227708100 = 43411^2 + 15090^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112223021 - 2¹³ = 2112214829 is a prime.

It is a super-2 number, since 2×2112223021² = 8922972180884732882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2112222986 and 2112223004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112221021) 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, 62124190 + ... + 62124223.

It is an arithmetic number, because the mean of its divisors is an integer number (559117863).

Almost surely, 2^2112223021 is an apocalyptic number.

It is an amenable number.

2112223021 is a deficient number, since it is larger than the sum of its proper divisors (124248431).

2112223021 is a wasteful number, since it uses less digits than its factorization.

2112223021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124248430.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2112223021 is about 45958.9275440583. The cubic root of 2112223021 is about 1283.0588912367.

Adding to 2112223021 its reverse (1203222112), we get a palindrome (3315445133).

Subtracting from 2112223021 its reverse (1203222112), we obtain a palindrome (909000909).

The spelling of 2112223021 in words is "two billion, one hundred twelve million, two hundred twenty-three thousand, twenty-one".