211222220111021 has 4 divisors (see below), whose sum is σ = 241396822984032. Its totient is φ = 181047617238012.

The previous prime is 211222220111017. The next prime is 211222220111041. The reversal of 211222220111021 is 120111022222112.

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 not a de Polignac number, because 211222220111021 - 2² = 211222220111017 is a prime.

It is a super-2 number, since 2×211222220111021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211222220110984 and 211222220111002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211222220111041) 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, 15087301436495 + ... + 15087301436508.

It is an arithmetic number, because the mean of its divisors is an integer number (60349205746008).

Almost surely, 2^{211222220111021} is an apocalyptic number.

It is an amenable number.

211222220111021 is a deficient number, since it is larger than the sum of its proper divisors (30174602873011).

211222220111021 is an equidigital number, since it uses as much as digits as its factorization.

211222220111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30174602873010.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 211222220111021 its reverse (120111022222112), we get a palindrome (331333242333133).

The spelling of 211222220111021 in words is "two hundred eleven trillion, two hundred twenty-two billion, two hundred twenty million, one hundred eleven thousand, twenty-one".