20101211222011 has 4 divisors (see below), whose sum is σ = 21159169707400. Its totient is φ = 19043252736624.

The previous prime is 20101211221997. The next prime is 20101211222021. The reversal of 20101211222011 is 11022211210102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20101211222011 - 2¹¹ = 20101211219963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20101211222021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 528979242666 + ... + 528979242703.

It is an arithmetic number, because the mean of its divisors is an integer number (5289792426850).

Almost surely, 2^{20101211222011} is an apocalyptic number.

20101211222011 is a deficient number, since it is larger than the sum of its proper divisors (1057958485389).

20101211222011 is a wasteful number, since it uses less digits than its factorization.

20101211222011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057958485388.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20101211222011 its reverse (11022211210102), we get a palindrome (31123422432113).

It can be divided in two parts, 20101 and 211222011, that added together give a palindrome (211242112).

The spelling of 20101211222011 in words is "twenty trillion, one hundred one billion, two hundred eleven million, two hundred twenty-two thousand, eleven".