20011221127 has 2 divisors, whose sum is σ = 20011221128. Its totient is φ = 20011221126.

The previous prime is 20011221107. The next prime is 20011221137. The reversal of 20011221127 is 72112211002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20011221127 - 2¹¹ = 20011219079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011221107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005610563 + 10005610564.

It is an arithmetic number, because the mean of its divisors is an integer number (10005610564).

Almost surely, 2^20011221127 is an apocalyptic number.

20011221127 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011221127 is an equidigital number, since it uses as much as digits as its factorization.

20011221127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 20011221127 its reverse (72112211002), we get a palindrome (92123432129).

The spelling of 20011221127 in words is "twenty billion, eleven million, two hundred twenty-one thousand, one hundred twenty-seven".