21002102020101 has 16 divisors (see below), whose sum is σ = 28104834302784. Its totient is φ = 13950449677824.

The previous prime is 21002102020093. The next prime is 21002102020139. The reversal of 21002102020101 is 10102020120012.

It is not a de Polignac number, because 21002102020101 - 2³ = 21002102020093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002101020101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6706191 + ... + 9326156.

It is an arithmetic number, because the mean of its divisors is an integer number (1756552143924).

Almost surely, 2^{21002102020101} is an apocalyptic number.

It is an amenable number.

21002102020101 is a deficient number, since it is larger than the sum of its proper divisors (7102732282683).

21002102020101 is a wasteful number, since it uses less digits than its factorization.

21002102020101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16033940.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21002102020101 its reverse (10102020120012), we get a palindrome (31104122140113).

The spelling of 21002102020101 in words is "twenty-one trillion, two billion, one hundred two million, twenty thousand, one hundred one".