210022021 has 8 divisors (see below), whose sum is σ = 230304384. Its totient is φ = 189937920.

The previous prime is 210021983. The next prime is 210022037. The reversal of 210022021 is 120220012.

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 210022021 - 2¹⁷ = 209890949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210021989 and 210022007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210022721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47341 + ... + 51586.

It is an arithmetic number, because the mean of its divisors is an integer number (28788048).

Almost surely, 2^210022021 is an apocalyptic number.

It is an amenable number.

210022021 is a deficient number, since it is larger than the sum of its proper divisors (20282363).

210022021 is a wasteful number, since it uses less digits than its factorization.

210022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99131.

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

The square root of 210022021 is about 14492.1365229562. The cubic root of 210022021 is about 594.4129709161.

Adding to 210022021 its reverse (120220012), we get a palindrome (330242033).

The spelling of 210022021 in words is "two hundred ten million, twenty-two thousand, twenty-one".