21210201101051 has 2 divisors, whose sum is σ = 21210201101052. Its totient is φ = 21210201101050.

The previous prime is 21210201101009. The next prime is 21210201101071. The reversal of 21210201101051 is 15010110201212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210201101051 is a prime.

It is not a weakly prime, because it can be changed into another prime (21210201101071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605100550525 + 10605100550526.

It is an arithmetic number, because the mean of its divisors is an integer number (10605100550526).

Almost surely, 2^{21210201101051} is an apocalyptic number.

21210201101051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210201101051 is an equidigital number, since it uses as much as digits as its factorization.

21210201101051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 17.

Adding to 21210201101051 its reverse (15010110201212), we get a palindrome (36220311302263).

The spelling of 21210201101051 in words is "twenty-one trillion, two hundred ten billion, two hundred one million, one hundred one thousand, fifty-one".