21011012110051 has 2 divisors, whose sum is σ = 21011012110052. Its totient is φ = 21011012110050.

The previous prime is 21011012109947. The next prime is 21011012110061. The reversal of 21011012110051 is 15001121011012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21011012110051 - 2¹¹ = 21011012108003 is a prime.

It is not a weakly prime, because it can be changed into another prime (21011012110061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505506055025 + 10505506055026.

It is an arithmetic number, because the mean of its divisors is an integer number (10505506055026).

Almost surely, 2^{21011012110051} is an apocalyptic number.

21011012110051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011012110051 is an equidigital number, since it uses as much as digits as its factorization.

21011012110051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20, while the sum is 16.

Adding to 21011012110051 its reverse (15001121011012), we get a palindrome (36012133121063).

The spelling of 21011012110051 in words is "twenty-one trillion, eleven billion, twelve million, one hundred ten thousand, fifty-one".