20011001211 has 16 divisors (see below), whose sum is σ = 29649784320. Its totient is φ = 13338932040.

The previous prime is 20011001173. The next prime is 20011001249. The reversal of 20011001211 is 11210011002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20011001173) and next prime (20011001249).

It is not a de Polignac number, because 20011001211 - 2¹¹ = 20010999163 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20011001193 and 20011001202.

It is not an unprimeable number, because it can be changed into a prime (20011001711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183426 + ... + 271416.

It is an arithmetic number, because the mean of its divisors is an integer number (1853111520).

Almost surely, 2^20011001211 is an apocalyptic number.

20011001211 is a deficient number, since it is larger than the sum of its proper divisors (9638783109).

20011001211 is an equidigital number, since it uses as much as digits as its factorization.

20011001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96423 (or 96417 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20011001211 its reverse (11210011002), we get a palindrome (31221012213).

The spelling of 20011001211 in words is "twenty billion, eleven million, one thousand, two hundred eleven".