21020003012101 has 8 divisors (see below), whose sum is σ = 21419356859640. Its totient is φ = 20620751017152.

The previous prime is 21020003012077. The next prime is 21020003012119. The reversal of 21020003012101 is 10121030002012.

It can be written as a sum of positive squares in 4 ways, for example, as 6268143147876 + 14751859864225 = 2503626^2 + 3840815^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21020003012101 - 2⁹ = 21020003011589 is a prime.

It is a super-2 number, since 2×21020003012101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020003012161) 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, 25046410 + ... + 25872043.

It is an arithmetic number, because the mean of its divisors is an integer number (2677419607455).

Almost surely, 2^{21020003012101} is an apocalyptic number.

It is an amenable number.

21020003012101 is a deficient number, since it is larger than the sum of its proper divisors (399353847539).

21020003012101 is an equidigital number, since it uses as much as digits as its factorization.

21020003012101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50926295.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21020003012101 its reverse (10121030002012), we get a palindrome (31141033014113).

The spelling of 21020003012101 in words is "twenty-one trillion, twenty billion, three million, twelve thousand, one hundred one".