21203122051 has 2 divisors, whose sum is σ = 21203122052. Its totient is φ = 21203122050.

The previous prime is 21203122009. The next prime is 21203122091. The reversal of 21203122051 is 15022130212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21203122051 - 2¹⁵ = 21203089283 is a prime.

It is not a weakly prime, because it can be changed into another prime (21203122091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601561025 + 10601561026.

It is an arithmetic number, because the mean of its divisors is an integer number (10601561026).

Almost surely, 2^21203122051 is an apocalyptic number.

21203122051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203122051 is an equidigital number, since it uses as much as digits as its factorization.

21203122051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21203122051 its reverse (15022130212), we get a palindrome (36225252263).

The spelling of 21203122051 in words is "twenty-one billion, two hundred three million, one hundred twenty-two thousand, fifty-one".