2011211021221 has 16 divisors (see below), whose sum is σ = 2042413954560. Its totient is φ = 1980177039360.

The previous prime is 2011211021153. The next prime is 2011211021243. The reversal of 2011211021221 is 1221201121102.

It is a cyclic number.

It is not a de Polignac number, because 2011211021221 - 2¹³ = 2011211013029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2011211021195 and 2011211021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011211025221) 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, 199539660 + ... + 199549738.

It is an arithmetic number, because the mean of its divisors is an integer number (127650872160).

Almost surely, 2^{2011211021221} is an apocalyptic number.

It is an amenable number.

2011211021221 is a deficient number, since it is larger than the sum of its proper divisors (31202933339).

2011211021221 is a wasteful number, since it uses less digits than its factorization.

2011211021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18156.

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

Adding to 2011211021221 its reverse (1221201121102), we get a palindrome (3232412142323).

It can be divided in two parts, 201121102 and 1221, that multiplied together give a palindrome (245568865542).

The spelling of 2011211021221 in words is "two trillion, eleven billion, two hundred eleven million, twenty-one thousand, two hundred twenty-one".