21111222022 has 32 divisors (see below), whose sum is σ = 36192328704. Its totient is φ = 9147837600.

The previous prime is 21111222019. The next prime is 21111222029. The reversal of 21111222022 is 22022211112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21111221987 and 21111222005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111222029) 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, 185313 + ... + 276700.

It is an arithmetic number, because the mean of its divisors is an integer number (1131010272).

Almost surely, 2^21111222022 is an apocalyptic number.

21111222022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21111222022 is a deficient number, since it is larger than the sum of its proper divisors (15081106682).

21111222022 is a wasteful number, since it uses less digits than its factorization.

21111222022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462124.

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

Adding to 21111222022 its reverse (22022211112), we get a palindrome (43133433134).

The spelling of 21111222022 in words is "twenty-one billion, one hundred eleven million, two hundred twenty-two thousand, twenty-two".