21110010102021 has 4 divisors (see below), whose sum is σ = 28146680136032. Its totient is φ = 14073340068012.

The previous prime is 21110010102019. The next prime is 21110010102107. The reversal of 21110010102021 is 12020101001112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21110010102021 - 2¹ = 21110010102019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110010101988 and 21110010102006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110010122021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3518335017001 + ... + 3518335017006.

It is an arithmetic number, because the mean of its divisors is an integer number (7036670034008).

Almost surely, 2^{21110010102021} is an apocalyptic number.

It is an amenable number.

21110010102021 is a deficient number, since it is larger than the sum of its proper divisors (7036670034011).

21110010102021 is an equidigital number, since it uses as much as digits as its factorization.

21110010102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7036670034010.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21110010102021 its reverse (12020101001112), we get a palindrome (33130111103133).

The spelling of 21110010102021 in words is "twenty-one trillion, one hundred ten billion, ten million, one hundred two thousand, twenty-one".