1001011020201 has 24 divisors (see below), whose sum is σ = 1492902587904. Its totient is φ = 645659657280.

The previous prime is 1001011020181. The next prime is 1001011020257. The reversal of 1001011020201 is 1020201101001.

It is a happy number.

It is not a de Polignac number, because 1001011020201 - 2²¹ = 1001008923049 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (1001011020001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 751140 + ... + 1601946.

It is an arithmetic number, because the mean of its divisors is an integer number (62204274496).

Almost surely, 2^{1001011020201} is an apocalyptic number.

It is an amenable number.

1001011020201 is a deficient number, since it is larger than the sum of its proper divisors (491891567703).

1001011020201 is a wasteful number, since it uses less digits than its factorization.

1001011020201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855061 (or 855058 counting only the distinct ones).

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

Adding to 1001011020201 its reverse (1020201101001), we get a palindrome (2021212121202).

The spelling of 1001011020201 in words is "one trillion, one billion, eleven million, twenty thousand, two hundred one".