210100001101021 has 4 divisors (see below), whose sum is σ = 210101018046844. Its totient is φ = 210098984155200.

The previous prime is 210100001100917. The next prime is 210100001101033. The reversal of 210100001101021 is 120101100001012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 84844621120996 + 125255379980025 = 9211114^2 + 11191755^2 .

It is a cyclic number.

It is not a de Polignac number, because 210100001101021 - 2²⁵ = 210099967546589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210100001100989 and 210100001101007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210100001101051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 508162950 + ... + 508576231.

It is an arithmetic number, because the mean of its divisors is an integer number (52525254511711).

Almost surely, 2^{210100001101021} is an apocalyptic number.

It is an amenable number.

210100001101021 is a deficient number, since it is larger than the sum of its proper divisors (1016945823).

210100001101021 is a wasteful number, since it uses less digits than its factorization.

210100001101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016945822.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 210100001101021 its reverse (120101100001012), we get a palindrome (330201101102033).

The spelling of 210100001101021 in words is "two hundred ten trillion, one hundred billion, one million, one hundred one thousand, twenty-one".