211121020021021 has 16 divisors (see below), whose sum is σ = 232597574352000. Its totient is φ = 190025143624000.

The previous prime is 211121020021001. The next prime is 211121020021049. The reversal of 211121020021021 is 120120020121112.

It is a cyclic number.

It is not a de Polignac number, because 211121020021021 - 2⁷ = 211121020020893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211121020020986 and 211121020021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121020021001) 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, 76637595 + ... + 79344583.

It is an arithmetic number, because the mean of its divisors is an integer number (14537348397000).

Almost surely, 2^{211121020021021} is an apocalyptic number.

It is an amenable number.

211121020021021 is a deficient number, since it is larger than the sum of its proper divisors (21476554330979).

211121020021021 is a wasteful number, since it uses less digits than its factorization.

211121020021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2777300.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211121020021021 its reverse (120120020121112), we get a palindrome (331241040142133).

The spelling of 211121020021021 in words is "two hundred eleven trillion, one hundred twenty-one billion, twenty million, twenty-one thousand, twenty-one".