211002202120021 has 16 divisors (see below), whose sum is σ = 237121352689536. Its totient is φ = 186296261126976.

The previous prime is 211002202120013. The next prime is 211002202120043. The reversal of 211002202120021 is 120021202200112.

It is a happy number.

It is not a de Polignac number, because 211002202120021 - 2³ = 211002202120013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211002202119977 and 211002202120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211002302120021) 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, 4309995 + ... + 20990008.

It is an arithmetic number, because the mean of its divisors is an integer number (14820084543096).

Almost surely, 2^{211002202120021} is an apocalyptic number.

It is an amenable number.

211002202120021 is a deficient number, since it is larger than the sum of its proper divisors (26119150569515).

211002202120021 is a wasteful number, since it uses less digits than its factorization.

211002202120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25327932.

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

Adding to 211002202120021 its reverse (120021202200112), we get a palindrome (331023404320133).

The spelling of 211002202120021 in words is "two hundred eleven trillion, two billion, two hundred two million, one hundred twenty thousand, twenty-one".