21144892147 has 2 divisors, whose sum is σ = 21144892148. Its totient is φ = 21144892146.

The previous prime is 21144892123. The next prime is 21144892183. The reversal of 21144892147 is 74129844112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21144892147 is a prime.

It is not a weakly prime, because it can be changed into another prime (21144892117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572446073 + 10572446074.

It is an arithmetic number, because the mean of its divisors is an integer number (10572446074).

Almost surely, 2^21144892147 is an apocalyptic number.

21144892147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21144892147 is an equidigital number, since it uses as much as digits as its factorization.

21144892147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 43.

The spelling of 21144892147 in words is "twenty-one billion, one hundred forty-four million, eight hundred ninety-two thousand, one hundred forty-seven".