21222212122120 has 16 divisors (see below), whose sum is σ = 47749977274860. Its totient is φ = 8488884848832.

The previous prime is 21222212122109. The next prime is 21222212122151. The reversal of 21222212122120 is 2122121222212.

It can be written as a sum of positive squares in 2 ways, for example, as 21118307757156 + 103904364964 = 4595466^2 + 322342^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21222212122091 and 21222212122100.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265277651487 + ... + 265277651566.

Almost surely, 2^{21222212122120} is an apocalyptic number.

21222212122120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222212122120 is an abundant number, since it is smaller than the sum of its proper divisors (26527765152740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21222212122120 is a wasteful number, since it uses less digits than its factorization.

21222212122120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530555303064 (or 530555303060 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21222212122120 its reverse (2122121222212), we get a palindrome (23344333344332).

The spelling of 21222212122120 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twelve million, one hundred twenty-two thousand, one hundred twenty".