202111121020021 has 16 divisors (see below), whose sum is σ = 208713025502208. Its totient is φ = 195514367529600.

The previous prime is 202111121020001. The next prime is 202111121020037. The reversal of 202111121020021 is 120020121111202.

It is not a de Polignac number, because 202111121020021 - 2¹⁵ = 202111120987253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202111121019977 and 202111121020004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202111121020001) 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, 906407481 + ... + 906630433.

It is an arithmetic number, because the mean of its divisors is an integer number (13044564093888).

Almost surely, 2^{202111121020021} is an apocalyptic number.

It is an amenable number.

202111121020021 is a deficient number, since it is larger than the sum of its proper divisors (6601904482187).

202111121020021 is a wasteful number, since it uses less digits than its factorization.

202111121020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234372.

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

Adding to 202111121020021 its reverse (120020121111202), we get a palindrome (322131242131223).

The spelling of 202111121020021 in words is "two hundred two trillion, one hundred eleven billion, one hundred twenty-one million, twenty thousand, twenty-one".