20100222121220 has 24 divisors (see below), whose sum is σ = 42378635654208. Its totient is φ = 8008056620000.

The previous prime is 20100222121219. The next prime is 20100222121247. The reversal of 20100222121220 is 2212122200102.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2002009136 + ... + 2002019175.

It is an arithmetic number, because the mean of its divisors is an integer number (1765776485592).

Almost surely, 2^{20100222121220} is an apocalyptic number.

20100222121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20100222121220 is an abundant number, since it is smaller than the sum of its proper divisors (22278413532988).

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

20100222121220 is a wasteful number, since it uses less digits than its factorization.

20100222121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4004028571 (or 4004028569 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20100222121220 its reverse (2212122200102), we get a palindrome (22312344321322).

The spelling of 20100222121220 in words is "twenty trillion, one hundred billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty".