201110001021 has 12 divisors (see below), whose sum is σ = 298343365372. Its totient is φ = 130449730176.

The previous prime is 201110001011. The next prime is 201110001023. The reversal of 201110001021 is 120100011102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 137737476900 + 63372524121 = 371130^2 + 251739^2 .

It is not a de Polignac number, because 201110001021 - 2¹⁵ = 201109968253 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 = 201110000994 and 201110001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201110001023) 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, 301966636 + ... + 301967301.

Almost surely, 2^201110001021 is an apocalyptic number.

It is an amenable number.

201110001021 is a deficient number, since it is larger than the sum of its proper divisors (97233364351).

201110001021 is a wasteful number, since it uses less digits than its factorization.

201110001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603933980 (or 603933977 counting only the distinct ones).

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

Adding to 201110001021 its reverse (120100011102), we get a palindrome (321210012123).

The spelling of 201110001021 in words is "two hundred one billion, one hundred ten million, one thousand, twenty-one".