210020002001221 has 16 divisors (see below), whose sum is σ = 211034180470464. Its totient is φ = 209007704433024.

The previous prime is 210020002001197. The next prime is 210020002001233. The reversal of 210020002001221 is 122100200020012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 210020002001221 - 2²³ = 210019993612613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210020002002221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3849101286 + ... + 3849155848.

It is an arithmetic number, because the mean of its divisors is an integer number (13189636279404).

Almost surely, 2^{210020002001221} is an apocalyptic number.

It is an amenable number.

210020002001221 is a deficient number, since it is larger than the sum of its proper divisors (1014178469243).

210020002001221 is a wasteful number, since it uses less digits than its factorization.

210020002001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71460.

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

Adding to 210020002001221 its reverse (122100200020012), we get a palindrome (332120202021233).

The spelling of 210020002001221 in words is "two hundred ten trillion, twenty billion, two million, one thousand, two hundred twenty-one".