20111321211 has 16 divisors (see below), whose sum is σ = 27121039488. Its totient is φ = 13255088000.

The previous prime is 20111321183. The next prime is 20111321239. The reversal of 20111321211 is 11212311102.

It is an interprime number because it is at equal distance from previous prime (20111321183) and next prime (20111321239).

It is a cyclic number.

It is not a de Polignac number, because 20111321211 - 2¹⁵ = 20111288443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20111321281) 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, 93811 + ... + 221411.

It is an arithmetic number, because the mean of its divisors is an integer number (1695064968).

Almost surely, 2^20111321211 is an apocalyptic number.

20111321211 is a deficient number, since it is larger than the sum of its proper divisors (7009718277).

20111321211 is a wasteful number, since it uses less digits than its factorization.

20111321211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128202.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 20111321211 its reverse (11212311102), we get a palindrome (31323632313).

The spelling of 20111321211 in words is "twenty billion, one hundred eleven million, three hundred twenty-one thousand, two hundred eleven".