21001120102101 has 4 divisors (see below), whose sum is σ = 28001493469472. Its totient is φ = 14000746734732.

The previous prime is 21001120102057. The next prime is 21001120102111. The reversal of 21001120102101 is 10120102110012.

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 21001120102101 - 2¹¹ = 21001120100053 is a prime.

It is a super-2 number, since 2×21001120102101² (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 (21001120102111) 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, 3500186683681 + ... + 3500186683686.

It is an arithmetic number, because the mean of its divisors is an integer number (7000373367368).

Almost surely, 2^{21001120102101} is an apocalyptic number.

It is an amenable number.

21001120102101 is a deficient number, since it is larger than the sum of its proper divisors (7000373367371).

21001120102101 is an equidigital number, since it uses as much as digits as its factorization.

21001120102101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7000373367370.

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

Adding to 21001120102101 its reverse (10120102110012), we get a palindrome (31121222212113).

The spelling of 21001120102101 in words is "twenty-one trillion, one billion, one hundred twenty million, one hundred two thousand, one hundred one".