21142019377 has 2 divisors, whose sum is σ = 21142019378. Its totient is φ = 21142019376.

The previous prime is 21142019351. The next prime is 21142019387. The reversal of 21142019377 is 77391024112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12250283761 + 8891735616 = 110681^2 + 94296^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21142019377 is a prime.

It is not a weakly prime, because it can be changed into another prime (21142019387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571009688 + 10571009689.

It is an arithmetic number, because the mean of its divisors is an integer number (10571009689).

Almost surely, 2^21142019377 is an apocalyptic number.

It is an amenable number.

21142019377 is a deficient number, since it is larger than the sum of its proper divisors (1).

21142019377 is an equidigital number, since it uses as much as digits as its factorization.

21142019377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 37.

The spelling of 21142019377 in words is "twenty-one billion, one hundred forty-two million, nineteen thousand, three hundred seventy-seven".