211222102021 has 4 divisors (see below), whose sum is σ = 241396688032. Its totient is φ = 181047516012.

The previous prime is 211222101991. The next prime is 211222102031. The reversal of 211222102021 is 120201222112.

It is a happy number.

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 211222102021 - 2⁵ = 211222101989 is a prime.

It is a super-2 number, since 2×211222102021² (a number of 23 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 = 211222101986 and 211222102004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211222102031) 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, 15087292995 + ... + 15087293008.

It is an arithmetic number, because the mean of its divisors is an integer number (60349172008).

Almost surely, 2^211222102021 is an apocalyptic number.

It is an amenable number.

211222102021 is a deficient number, since it is larger than the sum of its proper divisors (30174586011).

211222102021 is an equidigital number, since it uses as much as digits as its factorization.

211222102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30174586010.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 211222102021 its reverse (120201222112), we get a palindrome (331423324133).

The spelling of 211222102021 in words is "two hundred eleven billion, two hundred twenty-two million, one hundred two thousand, twenty-one".