21012103012021 has 8 divisors (see below), whose sum is σ = 23111734644288. Its totient is φ = 19101911827900.

The previous prime is 21012103011989. The next prime is 21012103012039. The reversal of 21012103012021 is 12021030121012.

It is not a de Polignac number, because 21012103012021 - 2⁵ = 21012103011989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21012103011986 and 21012103012004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012103019021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7893350665 + ... + 7893353326.

It is an arithmetic number, because the mean of its divisors is an integer number (2888966830536).

Almost surely, 2^{21012103012021} is an apocalyptic number.

It is an amenable number.

21012103012021 is a deficient number, since it is larger than the sum of its proper divisors (2099631632267).

21012103012021 is an equidigital number, since it uses as much as digits as its factorization.

21012103012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15786704024 (or 15786704002 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21012103012021 its reverse (12021030121012), we get a palindrome (33033133133033).

The spelling of 21012103012021 in words is "twenty-one trillion, twelve billion, one hundred three million, twelve thousand, twenty-one".