21212002111051 has 2 divisors, whose sum is σ = 21212002111052. Its totient is φ = 21212002111050.

The previous prime is 21212002111007. The next prime is 21212002111067. The reversal of 21212002111051 is 15011120021212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21212002111051 - 2⁹ = 21212002110539 is a prime.

It is not a weakly prime, because it can be changed into another prime (21212002111081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606001055525 + 10606001055526.

It is an arithmetic number, because the mean of its divisors is an integer number (10606001055526).

Almost surely, 2^{21212002111051} is an apocalyptic number.

21212002111051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212002111051 is an equidigital number, since it uses as much as digits as its factorization.

21212002111051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 19.

Adding to 21212002111051 its reverse (15011120021212), we get a palindrome (36223122132263).

The spelling of 21212002111051 in words is "twenty-one trillion, two hundred twelve billion, two million, one hundred eleven thousand, fifty-one".