2002220021 has 4 divisors (see below), whose sum is σ = 2012594412. Its totient is φ = 1991845632.

The previous prime is 2002219991. The next prime is 2002220029. The reversal of 2002220021 is 1200222002.

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 230736100 + 1771483921 = 15190^2 + 42089^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002220021 - 2¹⁰ = 2002218997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2002219984 and 2002220011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002220029) 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, 5186906 + ... + 5187291.

It is an arithmetic number, because the mean of its divisors is an integer number (503148603).

Almost surely, 2^2002220021 is an apocalyptic number.

It is an amenable number.

2002220021 is a deficient number, since it is larger than the sum of its proper divisors (10374391).

2002220021 is a wasteful number, since it uses less digits than its factorization.

2002220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10374390.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 2002220021 is about 44746.1732553746. The cubic root of 2002220021 is about 1260.3870527129.

Adding to 2002220021 its reverse (1200222002), we get a palindrome (3202442023).

The spelling of 2002220021 in words is "two billion, two million, two hundred twenty thousand, twenty-one".