21323211228 has 96 divisors (see below), whose sum is σ = 61208421120. Its totient is φ = 6365113920.

The previous prime is 21323211191. The next prime is 21323211229. The reversal of 21323211228 is 82211232312.

21323211228 is a `hidden beast` number, since 213 + 2 + 321 + 122 + 8 = 666.

It is a super-3 number, since 3×21323211228³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323211229) 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, 54351 + ... + 213542.

It is an arithmetic number, because the mean of its divisors is an integer number (637587720).

Almost surely, 2^21323211228 is an apocalyptic number.

It is an amenable number.

21323211228 is an abundant number, since it is smaller than the sum of its proper divisors (39885209892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21323211228 is a wasteful number, since it uses less digits than its factorization.

21323211228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267984 (or 267976 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The spelling of 21323211228 in words is "twenty-one billion, three hundred twenty-three million, two hundred eleven thousand, two hundred twenty-eight".