21210011051 has 2 divisors, whose sum is σ = 21210011052. Its totient is φ = 21210011050.

The previous prime is 21210011041. The next prime is 21210011071. The reversal of 21210011051 is 15011001212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21210011051 - 2³⁴ = 4030141867 is a prime.

It is not a weakly prime, because it can be changed into another prime (21210011041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605005525 + 10605005526.

It is an arithmetic number, because the mean of its divisors is an integer number (10605005526).

Almost surely, 2^21210011051 is an apocalyptic number.

21210011051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210011051 is an equidigital number, since it uses as much as digits as its factorization.

21210011051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20, while the sum is 14.

Adding to 21210011051 its reverse (15011001212), we get a palindrome (36221012263).

The spelling of 21210011051 in words is "twenty-one billion, two hundred ten million, eleven thousand, fifty-one".