102101010200021 has 4 divisors (see below), whose sum is σ = 116686868800032. Its totient is φ = 87515151600012.

The previous prime is 102101010199963. The next prime is 102101010200023. The reversal of 102101010200021 is 120002010101201.

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 a cyclic number.

It is not a de Polignac number, because 102101010200021 - 2¹⁸ = 102101009937877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102101010199975 and 102101010200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102101010200023) 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, 7292929299995 + ... + 7292929300008.

It is an arithmetic number, because the mean of its divisors is an integer number (29171717200008).

Almost surely, 2^{102101010200021} is an apocalyptic number.

It is an amenable number.

102101010200021 is a deficient number, since it is larger than the sum of its proper divisors (14585858600011).

102101010200021 is an equidigital number, since it uses as much as digits as its factorization.

102101010200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14585858600010.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 102101010200021 its reverse (120002010101201), we get a palindrome (222103020301222).

The spelling of 102101010200021 in words is "one hundred two trillion, one hundred one billion, ten million, two hundred thousand, twenty-one".