21142020401 has 2 divisors, whose sum is σ = 21142020402. Its totient is φ = 21142020400.

The previous prime is 21142020379. The next prime is 21142020413. The reversal of 21142020401 is 10402024112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10660356001 + 10481664400 = 103249^2 + 102380^2 .

It is a cyclic number.

It is not a de Polignac number, because 21142020401 - 2¹⁰ = 21142019377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21142020401.

It is not a weakly prime, because it can be changed into another prime (21142020901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571010200 + 10571010201.

It is an arithmetic number, because the mean of its divisors is an integer number (10571010201).

Almost surely, 2^21142020401 is an apocalyptic number.

It is an amenable number.

21142020401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21142020401 is an equidigital number, since it uses as much as digits as its factorization.

21142020401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21142020401 its reverse (10402024112), we get a palindrome (31544044513).

The spelling of 21142020401 in words is "twenty-one billion, one hundred forty-two million, twenty thousand, four hundred one".