201021212112021 has 32 divisors (see below), whose sum is σ = 340975593415680. Its totient is φ = 114659265350448.

The previous prime is 201021212111963. The next prime is 201021212112047. The reversal of 201021212112021 is 120211212120102.

201021212112021 is a `hidden beast` number, since 201 + 0 + 212 + 1 + 211 + 20 + 21 = 666.

It is not a de Polignac number, because 201021212112021 - 2²¹ = 201021210014869 is a prime.

It is a super-2 number, since 2×201021212112021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 201021212111985 and 201021212112003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021212113021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 972112611 + ... + 972319376.

It is an arithmetic number, because the mean of its divisors is an integer number (10655487294240).

Almost surely, 2^{201021212112021} is an apocalyptic number.

201021212112021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

201021212112021 is a deficient number, since it is larger than the sum of its proper divisors (139954381303659).

201021212112021 is a wasteful number, since it uses less digits than its factorization.

201021212112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1944432550 (or 1944432544 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 201021212112021 its reverse (120211212120102), we get a palindrome (321232424232123).

The spelling of 201021212112021 in words is "two hundred one trillion, twenty-one billion, two hundred twelve million, one hundred twelve thousand, twenty-one".