21210012010157 has 2 divisors, whose sum is σ = 21210012010158. Its totient is φ = 21210012010156.

The previous prime is 21210012010087. The next prime is 21210012010169. The reversal of 21210012010157 is 75101021001212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14288619240841 + 6921392769316 = 3780029^2 + 2630854^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210012010157 - 2¹⁶ = 21210011944621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210012010757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605006005078 + 10605006005079.

It is an arithmetic number, because the mean of its divisors is an integer number (10605006005079).

Almost surely, 2^{21210012010157} is an apocalyptic number.

It is an amenable number.

21210012010157 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210012010157 is an equidigital number, since it uses as much as digits as its factorization.

21210012010157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 23.

Adding to 21210012010157 its reverse (75101021001212), we get a palindrome (96311033011369).

The spelling of 21210012010157 in words is "twenty-one trillion, two hundred ten billion, twelve million, ten thousand, one hundred fifty-seven".