210001021101 has 24 divisors (see below), whose sum is σ = 317411055000. Its totient is φ = 133646737536.

The previous prime is 210001021093. The next prime is 210001021121. The reversal of 210001021101 is 101120100012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 89766152100 + 120234869001 = 299610^2 + 346749^2 .

It is not a de Polignac number, because 210001021101 - 2³ = 210001021093 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210001021121) 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, 5931726 + ... + 5967023.

It is an arithmetic number, because the mean of its divisors is an integer number (13225460625).

Almost surely, 2^210001021101 is an apocalyptic number.

It is an amenable number.

210001021101 is a deficient number, since it is larger than the sum of its proper divisors (107410033899).

210001021101 is a wasteful number, since it uses less digits than its factorization.

210001021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11898845 (or 11898842 counting only the distinct ones).

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

Adding to 210001021101 its reverse (101120100012), we get a palindrome (311121121113).

The spelling of 210001021101 in words is "two hundred ten billion, one million, twenty-one thousand, one hundred one".