201313021 has 12 divisors (see below), whose sum is σ = 252195132. Its totient is φ = 159280128.

The previous prime is 201313019. The next prime is 201313033. The reversal of 201313021 is 120313102.

It can be written as a sum of positive squares in 2 ways, for example, as 70324996 + 130988025 = 8386^2 + 11445^2 .

It is not a de Polignac number, because 201313021 - 2¹ = 201313019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 201312992 and 201313010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201313001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157380 + ... + 158653.

It is an arithmetic number, because the mean of its divisors is an integer number (21016261).

Almost surely, 2^201313021 is an apocalyptic number.

It is an amenable number.

201313021 is a deficient number, since it is larger than the sum of its proper divisors (50882111).

201313021 is a wasteful number, since it uses less digits than its factorization.

201313021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316060 (or 316053 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 201313021 is about 14188.4819836373. The cubic root of 201313021 is about 586.0805227791.

Adding to 201313021 its reverse (120313102), we get a palindrome (321626123).

The spelling of 201313021 in words is "two hundred one million, three hundred thirteen thousand, twenty-one".