21133227321 has 10 divisors (see below), whose sum is σ = 31569389082. Its totient is φ = 14088818160.

The previous prime is 21133227281. The next prime is 21133227371. The reversal of 21133227321 is 12372233112.

21133227321 is a `hidden beast` number, since 2 + 1 + 1 + 332 + 2 + 7 + 321 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17159690025 + 3973537296 = 130995^2 + 63036^2 .

It is not a de Polignac number, because 21133227321 - 2¹¹ = 21133225273 is a prime.

It is a super-2 number, since 2×21133227321² (a number of 21 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (21133227371) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 130451940 + ... + 130452101.

Almost surely, 2^21133227321 is an apocalyptic number.

It is an amenable number.

21133227321 is a deficient number, since it is larger than the sum of its proper divisors (10436161761).

21133227321 is an equidigital number, since it uses as much as digits as its factorization.

21133227321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260904053 (or 260904044 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The spelling of 21133227321 in words is "twenty-one billion, one hundred thirty-three million, two hundred twenty-seven thousand, three hundred twenty-one".