21250253435101 has 2 divisors, whose sum is σ = 21250253435102. Its totient is φ = 21250253435100.

The previous prime is 21250253435063. The next prime is 21250253435161. The reversal of 21250253435101 is 10153435205212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21213485756100 + 36767679001 = 4605810^2 + 191749^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21250253435101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21250253435161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10625126717550 + 10625126717551.

It is an arithmetic number, because the mean of its divisors is an integer number (10625126717551).

Almost surely, 2^{21250253435101} is an apocalyptic number.

It is an amenable number.

21250253435101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21250253435101 is an equidigital number, since it uses as much as digits as its factorization.

21250253435101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 34.

The spelling of 21250253435101 in words is "twenty-one trillion, two hundred fifty billion, two hundred fifty-three million, four hundred thirty-five thousand, one hundred one".