11211222021 has 4 divisors (see below), whose sum is σ = 14948296032. Its totient is φ = 7474148012.

The previous prime is 11211222017. The next prime is 11211222031. The reversal of 11211222021 is 12022211211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11211222021 - 2² = 11211222017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211222031) 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, 1868537001 + ... + 1868537006.

It is an arithmetic number, because the mean of its divisors is an integer number (3737074008).

Almost surely, 2^11211222021 is an apocalyptic number.

It is an amenable number.

11211222021 is a deficient number, since it is larger than the sum of its proper divisors (3737074011).

11211222021 is an equidigital number, since it uses as much as digits as its factorization.

11211222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3737074010.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 11211222021 its reverse (12022211211), we get a palindrome (23233433232).

The spelling of 11211222021 in words is "eleven billion, two hundred eleven million, two hundred twenty-two thousand, twenty-one".