21221001220122 has 24 divisors (see below), whose sum is σ = 50158730157120. Its totient is φ = 6430606430280.

The previous prime is 21221001220117. The next prime is 21221001220147. The reversal of 21221001220122 is 22102210012212.

It is a happy number.

21221001220122 is a `hidden beast` number, since 212 + 210 + 0 + 1 + 220 + 1 + 22 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21221001220095 and 21221001220104.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53588386722 + ... + 53588387117.

It is an arithmetic number, because the mean of its divisors is an integer number (2089947089880).

Almost surely, 2^{21221001220122} is an apocalyptic number.

21221001220122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21221001220122 is an abundant number, since it is smaller than the sum of its proper divisors (28937728936998).

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

21221001220122 is a wasteful number, since it uses less digits than its factorization.

21221001220122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107176773858 (or 107176773855 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21221001220122 its reverse (22102210012212), we get a palindrome (43323211232334).

The spelling of 21221001220122 in words is "twenty-one trillion, two hundred twenty-one billion, one million, two hundred twenty thousand, one hundred twenty-two".