222121221221020 has 96 divisors (see below), whose sum is σ = 535659745420800. Its totient is φ = 76517637868800.

The previous prime is 222121221220993. The next prime is 222121221221021. The reversal of 222121221221020 is 20122122121222.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 222121221220982 and 222121221221000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222121221221021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124636425 + ... + 126406015.

It is an arithmetic number, because the mean of its divisors is an integer number (5579789014800).

Almost surely, 2^{222121221221020} is an apocalyptic number.

222121221221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

222121221221020 is an abundant number, since it is smaller than the sum of its proper divisors (313538524199780).

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

222121221221020 is a wasteful number, since it uses less digits than its factorization.

222121221221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799659 (or 1799657 counting only the distinct ones).

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

Adding to 222121221221020 its reverse (20122122121222), we get a palindrome (242243343342242).

The spelling of 222121221221020 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-one thousand, twenty".