21143253227 has 8 divisors (see below), whose sum is σ = 21400477920. Its totient is φ = 20886465600.

The previous prime is 21143253211. The next prime is 21143253233. The reversal of 21143253227 is 72235234112.

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

It is a cyclic number.

It is not a de Polignac number, because 21143253227 - 2⁴ = 21143253211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21143253193 and 21143253202.

It is not an unprimeable number, because it can be changed into a prime (21143253247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11399 + ... + 205952.

It is an arithmetic number, because the mean of its divisors is an integer number (2675059740).

Almost surely, 2^21143253227 is an apocalyptic number.

21143253227 is a deficient number, since it is larger than the sum of its proper divisors (257224693).

21143253227 is a wasteful number, since it uses less digits than its factorization.

21143253227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218533.

The product of its digits is 20160, while the sum is 32.

Adding to 21143253227 its reverse (72235234112), we get a palindrome (93378487339).

The spelling of 21143253227 in words is "twenty-one billion, one hundred forty-three million, two hundred fifty-three thousand, two hundred twenty-seven".