2210646021 has 4 divisors (see below), whose sum is σ = 2947528032. Its totient is φ = 1473764012.

The previous prime is 2210645999. The next prime is 2210646023. The reversal of 2210646021 is 1206460122.

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.

It is a cyclic number.

It is not a de Polignac number, because 2210646021 - 2⁹ = 2210645509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2210645982 and 2210646000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2210646023) 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, 368441001 + ... + 368441006.

It is an arithmetic number, because the mean of its divisors is an integer number (736882008).

Almost surely, 2^2210646021 is an apocalyptic number.

It is an amenable number.

2210646021 is a deficient number, since it is larger than the sum of its proper divisors (736882011).

2210646021 is an equidigital number, since it uses as much as digits as its factorization.

2210646021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736882010.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 2210646021 is about 47017.5076008927. The cubic root of 2210646021 is about 1302.6859694945.

The spelling of 2210646021 in words is "two billion, two hundred ten million, six hundred forty-six thousand, twenty-one".