2200120021 has 4 divisors (see below), whose sum is σ = 2400130944. Its totient is φ = 2000109100.

The previous prime is 2200120009. The next prime is 2200120037. The reversal of 2200120021 is 1200210022.

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 not a de Polignac number, because 2200120021 - 2⁷ = 2200119893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2200129021) 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, 100005445 + ... + 100005466.

It is an arithmetic number, because the mean of its divisors is an integer number (600032736).

Almost surely, 2^2200120021 is an apocalyptic number.

It is an amenable number.

2200120021 is a deficient number, since it is larger than the sum of its proper divisors (200010923).

2200120021 is a wasteful number, since it uses less digits than its factorization.

2200120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200010922.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2200120021 is about 46905.4370089439. The cubic root of 2200120021 is about 1300.6150976768.

Adding to 2200120021 its reverse (1200210022), we get a palindrome (3400330043).

Subtracting from 2200120021 its reverse (1200210022), we obtain a palindrome (999909999).

It can be divided in two parts, 2200 and 120021, that added together give a palindrome (122221).

The spelling of 2200120021 in words is "two billion, two hundred million, one hundred twenty thousand, twenty-one".