20021102101 has 32 divisors (see below), whose sum is σ = 26910148608. Its totient is φ = 14385435840.

The previous prime is 20021102039. The next prime is 20021102107. The reversal of 20021102101 is 10120112002.

It is a cyclic number.

It is not a de Polignac number, because 20021102101 - 2¹⁵ = 20021069333 is a prime.

It is a super-2 number, since 2×20021102101² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021102107) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 973810 + ... + 994156.

It is an arithmetic number, because the mean of its divisors is an integer number (840942144).

Almost surely, 2^20021102101 is an apocalyptic number.

It is an amenable number.

20021102101 is a deficient number, since it is larger than the sum of its proper divisors (6889046507).

20021102101 is a wasteful number, since it uses less digits than its factorization.

20021102101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21361.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20021102101 its reverse (10120112002), we get a palindrome (30141214103).

Subtracting from 20021102101 its reverse (10120112002), we obtain a palindrome (9900990099).

The spelling of 20021102101 in words is "twenty billion, twenty-one million, one hundred two thousand, one hundred one".