211210022120021 has 16 divisors (see below), whose sum is σ = 215721414881280. Its totient is φ = 206750410005360.

The previous prime is 211210022120011. The next prime is 211210022120059. The reversal of 211210022120021 is 120021220012112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211210022120021 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 (211210022120011) 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, 8113781 + ... + 22096458.

It is an arithmetic number, because the mean of its divisors is an integer number (13482588430080).

Almost surely, 2^{211210022120021} is an apocalyptic number.

It is an amenable number.

211210022120021 is a deficient number, since it is larger than the sum of its proper divisors (4511392761259).

211210022120021 is a wasteful number, since it uses less digits than its factorization.

211210022120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30211096.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 211210022120021 its reverse (120021220012112), we get a palindrome (331231242132133).

The spelling of 211210022120021 in words is "two hundred eleven trillion, two hundred ten billion, twenty-two million, one hundred twenty thousand, twenty-one".