21321451147 has 2 divisors, whose sum is σ = 21321451148. Its totient is φ = 21321451146.

The previous prime is 21321451121. The next prime is 21321451171. The reversal of 21321451147 is 74115412312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21321451147 - 2¹⁹ = 21320926859 is a prime.

It is not a weakly prime, because it can be changed into another prime (21321451747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660725573 + 10660725574.

It is an arithmetic number, because the mean of its divisors is an integer number (10660725574).

Almost surely, 2^21321451147 is an apocalyptic number.

21321451147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321451147 is an equidigital number, since it uses as much as digits as its factorization.

21321451147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 31.

Adding to 21321451147 its reverse (74115412312), we get a palindrome (95436863459).

The spelling of 21321451147 in words is "twenty-one billion, three hundred twenty-one million, four hundred fifty-one thousand, one hundred forty-seven".