201211020021 has 16 divisors (see below), whose sum is σ = 299476869120. Its totient is φ = 119110116720.

The previous prime is 201211020013. The next prime is 201211020041. The reversal of 201211020021 is 120020112102.

It is not a de Polignac number, because 201211020021 - 2³ = 201211020013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201211019979 and 201211020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211020041) 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, 70897461 + ... + 70900298.

It is an arithmetic number, because the mean of its divisors is an integer number (18717304320).

Almost surely, 2^201211020021 is an apocalyptic number.

It is an amenable number.

201211020021 is a deficient number, since it is larger than the sum of its proper divisors (98265849099).

201211020021 is a wasteful number, since it uses less digits than its factorization.

201211020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141797816.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 201211020021 its reverse (120020112102), we get a palindrome (321231132123).

The spelling of 201211020021 in words is "two hundred one billion, two hundred eleven million, twenty thousand, twenty-one".