211121020202021 has 16 divisors (see below), whose sum is σ = 216087566082048. Its totient is φ = 206174724865200.

The previous prime is 211121020202017. The next prime is 211121020202077. The reversal of 211121020202021 is 120202020121112.

It is a cyclic number.

It is not a de Polignac number, because 211121020202021 - 2² = 211121020202017 is a prime.

It is a super-2 number, since 2×211121020202021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121020205021) 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, 38311076 + ... + 43473906.

It is an arithmetic number, because the mean of its divisors is an integer number (13505472880128).

Almost surely, 2^{211121020202021} is an apocalyptic number.

It is an amenable number.

211121020202021 is a deficient number, since it is larger than the sum of its proper divisors (4966545880027).

211121020202021 is a wasteful number, since it uses less digits than its factorization.

211121020202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5164792.

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

Adding to 211121020202021 its reverse (120202020121112), we get a palindrome (331323040323133).

The spelling of 211121020202021 in words is "two hundred eleven trillion, one hundred twenty-one billion, twenty million, two hundred two thousand, twenty-one".