21012332147 has 2 divisors, whose sum is σ = 21012332148. Its totient is φ = 21012332146.

The previous prime is 21012332071. The next prime is 21012332149. The reversal of 21012332147 is 74123321012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21012332147 - 2¹⁴ = 21012315763 is a prime.

Together with 21012332149, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21012332149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506166073 + 10506166074.

It is an arithmetic number, because the mean of its divisors is an integer number (10506166074).

Almost surely, 2^21012332147 is an apocalyptic number.

21012332147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012332147 is an equidigital number, since it uses as much as digits as its factorization.

21012332147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 26.

Adding to 21012332147 its reverse (74123321012), we get a palindrome (95135653159).

The spelling of 21012332147 in words is "twenty-one billion, twelve million, three hundred thirty-two thousand, one hundred forty-seven".