20011220051 has 2 divisors, whose sum is σ = 20011220052. Its totient is φ = 20011220050.

The previous prime is 20011220029. The next prime is 20011220063. The reversal of 20011220051 is 15002211002.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011220051 is a prime.

It is not a weakly prime, because it can be changed into another prime (20011220351) 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, 10005610025 + 10005610026.

It is an arithmetic number, because the mean of its divisors is an integer number (10005610026).

Almost surely, 2^20011220051 is an apocalyptic number.

20011220051 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011220051 is an equidigital number, since it uses as much as digits as its factorization.

20011220051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 14.

Adding to 20011220051 its reverse (15002211002), we get a palindrome (35013431053).

The spelling of 20011220051 in words is "twenty billion, eleven million, two hundred twenty thousand, fifty-one".