2002220921 has 2 divisors, whose sum is σ = 2002220922. Its totient is φ = 2002220920.

The previous prime is 2002220879. The next prime is 2002220933. The reversal of 2002220921 is 1290222002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1809566521 + 192654400 = 42539^2 + 13880^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002220921 - 2²² = 1998026617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2002220893 and 2002220902.

It is not a weakly prime, because it can be changed into another prime (2002220321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001110460 + 1001110461.

It is an arithmetic number, because the mean of its divisors is an integer number (1001110461).

Almost surely, 2^2002220921 is an apocalyptic number.

It is an amenable number.

2002220921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2002220921 is an equidigital number, since it uses as much as digits as its factorization.

2002220921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 2002220921 is about 44746.1833120994. The cubic root of 2002220921 is about 1260.3872415613.

Adding to 2002220921 its reverse (1290222002), we get a palindrome (3292442923).

The spelling of 2002220921 in words is "two billion, two million, two hundred twenty thousand, nine hundred twenty-one".