21020102202101 has 16 divisors (see below), whose sum is σ = 21844766112768. Its totient is φ = 20204828716800.

The previous prime is 21020102202067. The next prime is 21020102202107. The reversal of 21020102202101 is 10120220102012.

It is a cyclic number.

It is not a de Polignac number, because 21020102202101 - 2³⁰ = 21019028460277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020102202107) 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, 3628445 + ... + 7430061.

It is an arithmetic number, because the mean of its divisors is an integer number (1365297882048).

Almost surely, 2^{21020102202101} is an apocalyptic number.

It is an amenable number.

21020102202101 is a deficient number, since it is larger than the sum of its proper divisors (824663910667).

21020102202101 is a wasteful number, since it uses less digits than its factorization.

21020102202101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3802852.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21020102202101 its reverse (10120220102012), we get a palindrome (31140322304113).

The spelling of 21020102202101 in words is "twenty-one trillion, twenty billion, one hundred two million, two hundred two thousand, one hundred one".