21232121273 has 16 divisors (see below), whose sum is σ = 24393830400. Its totient is φ = 18276702480.

The previous prime is 21232121257. The next prime is 21232121303. The reversal of 21232121273 is 37212123212.

It is a cyclic number.

It is not a de Polignac number, because 21232121273 - 2⁴ = 21232121257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21232121213) 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, 401240 + ... + 451062.

It is an arithmetic number, because the mean of its divisors is an integer number (1524614400).

Almost surely, 2^21232121273 is an apocalyptic number.

It is an amenable number.

21232121273 is a deficient number, since it is larger than the sum of its proper divisors (3161709127).

21232121273 is a wasteful number, since it uses less digits than its factorization.

21232121273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51892.

The product of its digits is 2016, while the sum is 26.

Adding to 21232121273 its reverse (37212123212), we get a palindrome (58444244485).

The spelling of 21232121273 in words is "twenty-one billion, two hundred thirty-two million, one hundred twenty-one thousand, two hundred seventy-three".