11021222121211 has 4 divisors (see below), whose sum is σ = 11601286443400. Its totient is φ = 10441157799024.

The previous prime is 11021222121191. The next prime is 11021222121257. The reversal of 11021222121211 is 11212122212011.

It is a happy number.

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 11021222121211 - 2¹¹ = 11021222119163 is a prime.

It is a super-2 number, since 2×11021222121211² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 580064322169 = 11021222121211 / (1 + 1 + 0 + 2 + 1 + 2 + 2 + 2 + 1 + 2 + 1 + 2 + 1 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11021222121311) 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, 290032161066 + ... + 290032161103.

It is an arithmetic number, because the mean of its divisors is an integer number (2900321610850).

Almost surely, 2^{11021222121211} is an apocalyptic number.

11021222121211 is a deficient number, since it is larger than the sum of its proper divisors (580064322189).

11021222121211 is an equidigital number, since it uses as much as digits as its factorization.

11021222121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580064322188.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11021222121211 its reverse (11212122212011), we get a palindrome (22233344333222).

The spelling of 11021222121211 in words is "eleven trillion, twenty-one billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred eleven".