210000022021 has 4 divisors (see below), whose sum is σ = 210005636332. Its totient is φ = 209994407712.

The previous prime is 210000021989. The next prime is 210000022031. The reversal of 210000022021 is 120220000012.

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 115882372225 + 94117649796 = 340415^2 + 306786^2 .

It is a cyclic number.

It is not a de Polignac number, because 210000022021 - 2⁵ = 210000021989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210000021989 and 210000022007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210000022031) 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, 2750670 + ... + 2825983.

It is an arithmetic number, because the mean of its divisors is an integer number (52501409083).

Almost surely, 2^210000022021 is an apocalyptic number.

It is an amenable number.

210000022021 is a deficient number, since it is larger than the sum of its proper divisors (5614311).

210000022021 is an equidigital number, since it uses as much as digits as its factorization.

210000022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5614310.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 210000022021 its reverse (120220000012), we get a palindrome (330220022033).

The spelling of 210000022021 in words is "two hundred ten billion, twenty-two thousand, twenty-one".