201211021021 has 16 divisors (see below), whose sum is σ = 215579750400. Its totient is φ = 187126460928.

The previous prime is 201211020979. The next prime is 201211021087. The reversal of 201211021021 is 120120112102.

It is a cyclic number.

It is not a de Polignac number, because 201211021021 - 2⁷ = 201211020893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201211020992 and 201211021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211025021) 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, 2346916 + ... + 2431138.

It is an arithmetic number, because the mean of its divisors is an integer number (13473734400).

Almost surely, 2^201211021021 is an apocalyptic number.

It is an amenable number.

201211021021 is a deficient number, since it is larger than the sum of its proper divisors (14368729379).

201211021021 is a wasteful number, since it uses less digits than its factorization.

201211021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85908.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 201211021021 its reverse (120120112102), we get a palindrome (321331133123).

The spelling of 201211021021 in words is "two hundred one billion, two hundred eleven million, twenty-one thousand, twenty-one".