2101022021 has 8 divisors (see below), whose sum is σ = 2428148160. Its totient is φ = 1780640928.

The previous prime is 2101021943. The next prime is 2101022029. The reversal of 2101022021 is 1202201012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2101022021 - 2²⁶ = 2033913157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101021993 and 2101022011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101022029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1685591 + ... + 1686836.

It is an arithmetic number, because the mean of its divisors is an integer number (303518520).

Almost surely, 2^2101022021 is an apocalyptic number.

It is an amenable number.

2101022021 is a deficient number, since it is larger than the sum of its proper divisors (327126139).

2101022021 is an equidigital number, since it uses as much as digits as its factorization.

2101022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3372523.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2101022021 is about 45836.9067564555. The cubic root of 2101022021 is about 1280.7868739619.

Adding to 2101022021 its reverse (1202201012), we get a palindrome (3303223033).

The spelling of 2101022021 in words is "two billion, one hundred one million, twenty-two thousand, twenty-one".