21201131022123 has 8 divisors (see below), whose sum is σ = 30442649672848. Its totient is φ = 13046849859744.

The previous prime is 21201131022091. The next prime is 21201131022139. The reversal of 21201131022123 is 32122013110212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21201131022123 - 2⁵ = 21201131022091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21201131022123.

It is not an unprimeable number, because it can be changed into a prime (21201131022223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271809372040 + ... + 271809372117.

It is an arithmetic number, because the mean of its divisors is an integer number (3805331209106).

Almost surely, 2^{21201131022123} is an apocalyptic number.

21201131022123 is a deficient number, since it is larger than the sum of its proper divisors (9241518650725).

21201131022123 is a wasteful number, since it uses less digits than its factorization.

21201131022123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543618744173.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21201131022123 its reverse (32122013110212), we get a palindrome (53323144132335).

The spelling of 21201131022123 in words is "twenty-one trillion, two hundred one billion, one hundred thirty-one million, twenty-two thousand, one hundred twenty-three".