2102220021 has 32 divisors (see below), whose sum is σ = 3247303680. Its totient is φ = 1196294400.

The previous prime is 2102219993. The next prime is 2102220023. The reversal of 2102220021 is 1200222012.

It is not a de Polignac number, because 2102220021 - 2⁵ = 2102219989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2102219979 and 2102220006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102220023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56016 + ... + 85686.

It is an arithmetic number, because the mean of its divisors is an integer number (101478240).

Almost surely, 2^2102220021 is an apocalyptic number.

It is an amenable number.

2102220021 is a deficient number, since it is larger than the sum of its proper divisors (1145083659).

2102220021 is a wasteful number, since it uses less digits than its factorization.

2102220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29817.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 2102220021 is about 45849.9729661861. The cubic root of 2102220021 is about 1281.0302620397.

Adding to 2102220021 its reverse (1200222012), we get a palindrome (3302442033).

The spelling of 2102220021 in words is "two billion, one hundred two million, two hundred twenty thousand, twenty-one".