2210022100021 has 4 divisors (see below), whose sum is σ = 2234853809100. Its totient is φ = 2185190390944.

The previous prime is 2210022100019. The next prime is 2210022100043. The reversal of 2210022100021 is 1200012200122.

It is a happy number.

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 736359636996 + 1473662463025 = 858114^2 + 1213945^2 .

It is a cyclic number.

It is not a de Polignac number, because 2210022100021 - 2¹ = 2210022100019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2210022099974 and 2210022100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2210022100061) 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 3 ways as a sum of consecutive naturals, for example, 12415854406 + ... + 12415854583.

It is an arithmetic number, because the mean of its divisors is an integer number (558713452275).

Almost surely, 2^{2210022100021} is an apocalyptic number.

It is an amenable number.

2210022100021 is a deficient number, since it is larger than the sum of its proper divisors (24831709079).

2210022100021 is an equidigital number, since it uses as much as digits as its factorization.

2210022100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24831709078.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2210022100021 its reverse (1200012200122), we get a palindrome (3410034300143).

The spelling of 2210022100021 in words is "two trillion, two hundred ten billion, twenty-two million, one hundred thousand, twenty-one".