210212221021 has 8 divisors (see below), whose sum is σ = 229342161888. Its totient is φ = 191085570000.

The previous prime is 210212221007. The next prime is 210212221031. The reversal of 210212221021 is 120122212012.

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 210212221021 - 2¹¹ = 210212218973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210212220986 and 210212221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210212221031) 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, 687895 + ... + 945316.

It is an arithmetic number, because the mean of its divisors is an integer number (28667770236).

Almost surely, 2^210212221021 is an apocalyptic number.

It is an amenable number.

210212221021 is a deficient number, since it is larger than the sum of its proper divisors (19129940867).

210212221021 is a wasteful number, since it uses less digits than its factorization.

210212221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644923.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 210212221021 its reverse (120122212012), we get a palindrome (330334433033).

Subtracting from 210212221021 its reverse (120122212012), we obtain a palindrome (90090009009).

The spelling of 210212221021 in words is "two hundred ten billion, two hundred twelve million, two hundred twenty-one thousand, twenty-one".