201010101021 has 12 divisors (see below), whose sum is σ = 298195165372. Its totient is φ = 130384930176.

The previous prime is 201010101011. The next prime is 201010101023. The reversal of 201010101021 is 120101010102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 102752302500 + 98257798521 = 320550^2 + 313461^2 .

It is not a de Polignac number, because 201010101021 - 2³⁰ = 199936359197 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201010100994 and 201010101012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201010101023) 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, 301816636 + ... + 301817301.

Almost surely, 2^201010101021 is an apocalyptic number.

It is an amenable number.

201010101021 is a deficient number, since it is larger than the sum of its proper divisors (97185064351).

201010101021 is a wasteful number, since it uses less digits than its factorization.

201010101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603633980 (or 603633977 counting only the distinct ones).

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

Adding to 201010101021 its reverse (120101010102), we get a palindrome (321111111123).

The spelling of 201010101021 in words is "two hundred one billion, ten million, one hundred one thousand, twenty-one".