21211400051 has 2 divisors, whose sum is σ = 21211400052. Its totient is φ = 21211400050.

The previous prime is 21211400047. The next prime is 21211400053. The reversal of 21211400051 is 15000411212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21211400051 - 2² = 21211400047 is a prime.

It is a Sophie Germain prime.

Together with 21211400053, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21211400053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605700025 + 10605700026.

It is an arithmetic number, because the mean of its divisors is an integer number (10605700026).

Almost surely, 2^21211400051 is an apocalyptic number.

21211400051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211400051 is an equidigital number, since it uses as much as digits as its factorization.

21211400051 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 17.

Adding to 21211400051 its reverse (15000411212), we get a palindrome (36211811263).

The spelling of 21211400051 in words is "twenty-one billion, two hundred eleven million, four hundred thousand, fifty-one".