2210210021 has 4 divisors (see below), whose sum is σ = 2211738912. Its totient is φ = 2208681132.

The previous prime is 2210209997. The next prime is 2210210027. The reversal of 2210210021 is 1200120122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1200120122 = 2 ⋅600060061.

It is a cyclic number.

It is not a de Polignac number, because 2210210021 - 2¹⁰ = 2210208997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2210209984 and 2210210011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2210210027) 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, 762275 + ... + 765168.

It is an arithmetic number, because the mean of its divisors is an integer number (552934728).

Almost surely, 2^2210210021 is an apocalyptic number.

It is an amenable number.

2210210021 is a deficient number, since it is larger than the sum of its proper divisors (1528891).

2210210021 is a wasteful number, since it uses less digits than its factorization.

2210210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528890.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2210210021 is about 47012.8708015156. The cubic root of 2210210021 is about 1302.6003220682.

Adding to 2210210021 its reverse (1200120122), we get a palindrome (3410330143).

It can be divided in two parts, 22102 and 10021, that added together give a palindrome (32123).

The spelling of 2210210021 in words is "two billion, two hundred ten million, two hundred ten thousand, twenty-one".