21121323201 has 48 divisors (see below), whose sum is σ = 34373626560. Its totient is φ = 12384869760.

The previous prime is 21121323151. The next prime is 21121323227. The reversal of 21121323201 is 10232312112.

21121323201 is a `hidden beast` number, since 21 + 121 + 323 + 201 = 666.

It is not a de Polignac number, because 21121323201 - 2⁹ = 21121322689 is a prime.

It is a super-2 number, since 2×21121323201² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121323401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 639571 + ... + 671783.

It is an arithmetic number, because the mean of its divisors is an integer number (716117220).

Almost surely, 2^21121323201 is an apocalyptic number.

It is an amenable number.

21121323201 is a deficient number, since it is larger than the sum of its proper divisors (13252303359).

21121323201 is a wasteful number, since it uses less digits than its factorization.

21121323201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32446 (or 32443 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21121323201 its reverse (10232312112), we get a palindrome (31353635313).

The spelling of 21121323201 in words is "twenty-one billion, one hundred twenty-one million, three hundred twenty-three thousand, two hundred one".