21142842101 has 2 divisors, whose sum is σ = 21142842102. Its totient is φ = 21142842100.

The previous prime is 21142842067. The next prime is 21142842113. The reversal of 21142842101 is 10124824112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18926880625 + 2215961476 = 137575^2 + 47074^2 .

It is a cyclic number.

It is not a de Polignac number, because 21142842101 - 2²² = 21138647797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21142842001) 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 as a sum of consecutive naturals, namely, 10571421050 + 10571421051.

It is an arithmetic number, because the mean of its divisors is an integer number (10571421051).

Almost surely, 2^21142842101 is an apocalyptic number.

It is an amenable number.

21142842101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21142842101 is an equidigital number, since it uses as much as digits as its factorization.

21142842101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 26.

The spelling of 21142842101 in words is "twenty-one billion, one hundred forty-two million, eight hundred forty-two thousand, one hundred one".