201011021001 has 48 divisors (see below), whose sum is σ = 340376699520. Its totient is φ = 111917272320.

The previous prime is 201011020957. The next prime is 201011021017. The reversal of 201011021001 is 100120110102.

It is a happy number.

It is not a de Polignac number, because 201011021001 - 2¹³ = 201011012809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201011021041) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1017271 + ... + 1198691.

It is an arithmetic number, because the mean of its divisors is an integer number (7091181240).

Almost surely, 2^201011021001 is an apocalyptic number.

201011021001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

201011021001 is a deficient number, since it is larger than the sum of its proper divisors (139365678519).

201011021001 is a wasteful number, since it uses less digits than its factorization.

201011021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181886 (or 181883 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 201011021001 its reverse (100120110102), we get a palindrome (301131131103).

The spelling of 201011021001 in words is "two hundred one billion, eleven million, twenty-one thousand, one".