21122102001220 has 48 divisors (see below), whose sum is σ = 48389887643328. Its totient is φ = 7680594181760.

The previous prime is 21122102001191. The next prime is 21122102001239. The reversal of 21122102001220 is 2210020122112.

It is a happy number.

It is a super-2 number, since 2×21122102001220² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122102001194 and 21122102001203.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9108687 + ... + 11189833.

It is an arithmetic number, because the mean of its divisors is an integer number (1008122659236).

Almost surely, 2^{21122102001220} is an apocalyptic number.

21122102001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122102001220 is an abundant number, since it is smaller than the sum of its proper divisors (27267785642108).

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

21122102001220 is a wasteful number, since it uses less digits than its factorization.

21122102001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127300 (or 2127298 counting only the distinct ones).

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

Adding to 21122102001220 its reverse (2210020122112), we get a palindrome (23332122123332).

The spelling of 21122102001220 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred two million, one thousand, two hundred twenty".