211202122120021 has 16 divisors (see below), whose sum is σ = 219140022140928. Its totient is φ = 203335762964400.

The previous prime is 211202122120019. The next prime is 211202122120027. The reversal of 211202122120021 is 120021221202112.

It is a cyclic number.

It is not a de Polignac number, because 211202122120021 - 2¹ = 211202122120019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211202122120027) 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, 6786 + ... + 20552476.

It is an arithmetic number, because the mean of its divisors is an integer number (13696251383808).

Almost surely, 2^{211202122120021} is an apocalyptic number.

It is an amenable number.

211202122120021 is a deficient number, since it is larger than the sum of its proper divisors (7937900020907).

211202122120021 is a wasteful number, since it uses less digits than its factorization.

211202122120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20547432.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 211202122120021 its reverse (120021221202112), we get a palindrome (331223343322133).

The spelling of 211202122120021 in words is "two hundred eleven trillion, two hundred two billion, one hundred twenty-two million, one hundred twenty thousand, twenty-one".