21142101457 has 2 divisors, whose sum is σ = 21142101458. Its totient is φ = 21142101456.

The previous prime is 21142101427. The next prime is 21142101503. The reversal of 21142101457 is 75410124112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20977466896 + 164634561 = 144836^2 + 12831^2 .

It is a cyclic number.

It is not a de Polignac number, because 21142101457 - 2¹¹ = 21142099409 is a prime.

It is not a weakly prime, because it can be changed into another prime (21142101427) 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, 10571050728 + 10571050729.

It is an arithmetic number, because the mean of its divisors is an integer number (10571050729).

Almost surely, 2^21142101457 is an apocalyptic number.

It is an amenable number.

21142101457 is a deficient number, since it is larger than the sum of its proper divisors (1).

21142101457 is an equidigital number, since it uses as much as digits as its factorization.

21142101457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 28.

Adding to 21142101457 its reverse (75410124112), we get a palindrome (96552225569).

The spelling of 21142101457 in words is "twenty-one billion, one hundred forty-two million, one hundred one thousand, four hundred fifty-seven".