20011112202721 has 2 divisors, whose sum is σ = 20011112202722. Its totient is φ = 20011112202720.

The previous prime is 20011112202677. The next prime is 20011112202797. The reversal of 20011112202721 is 12720221111002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19476113580625 + 534998622096 = 4413175^2 + 731436^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011112202721 - 2⁹ = 20011112202209 is a prime.

It is a super-2 number, since 2×20011112202721² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20011112202692 and 20011112202701.

It is not a weakly prime, because it can be changed into another prime (20011112202821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005556101360 + 10005556101361.

It is an arithmetic number, because the mean of its divisors is an integer number (10005556101361).

Almost surely, 2^{20011112202721} is an apocalyptic number.

It is an amenable number.

20011112202721 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011112202721 is an equidigital number, since it uses as much as digits as its factorization.

20011112202721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 20011112202721 its reverse (12720221111002), we get a palindrome (32731333313723).

The spelling of 20011112202721 in words is "twenty trillion, eleven billion, one hundred twelve million, two hundred two thousand, seven hundred twenty-one".