21020123101101 has 16 divisors (see below), whose sum is σ = 29502104601600. Its totient is φ = 13275787372848.

The previous prime is 21020123101009. The next prime is 21020123101129. The reversal of 21020123101101 is 10110132102012.

It is not a de Polignac number, because 21020123101101 - 2¹⁰ = 21020123100077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020123101151) 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, 9300730 + ... + 11337716.

It is an arithmetic number, because the mean of its divisors is an integer number (1843881537600).

Almost surely, 2^{21020123101101} is an apocalyptic number.

It is an amenable number.

21020123101101 is a deficient number, since it is larger than the sum of its proper divisors (8481981500499).

21020123101101 is a wasteful number, since it uses less digits than its factorization.

21020123101101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2218048.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21020123101101 its reverse (10110132102012), we get a palindrome (31130255203113).

The spelling of 21020123101101 in words is "twenty-one trillion, twenty billion, one hundred twenty-three million, one hundred one thousand, one hundred one".