201145221 has 32 divisors (see below), whose sum is σ = 308246400. Its totient is φ = 129548160.

The previous prime is 201145213. The next prime is 201145223. The reversal of 201145221 is 122541102.

It is not a de Polignac number, because 201145221 - 2³ = 201145213 is a prime.

It is a super-2 number, since 2×201145221² = 80918799862277682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 201145194 and 201145203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201145223) 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, 119830 + ... + 121496.

It is an arithmetic number, because the mean of its divisors is an integer number (9632700).

Almost surely, 2^201145221 is an apocalyptic number.

It is an amenable number.

201145221 is a deficient number, since it is larger than the sum of its proper divisors (107101179).

201145221 is a wasteful number, since it uses less digits than its factorization.

201145221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826 (or 1820 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 201145221 is about 14182.5675038055. The cubic root of 201145221 is about 585.9176393780.

Adding to 201145221 its reverse (122541102), we get a palindrome (323686323).

The spelling of 201145221 in words is "two hundred one million, one hundred forty-five thousand, two hundred twenty-one".