210220121221020 has 72 divisors (see below), whose sum is σ = 637694776148976. Its totient is φ = 56056318762752.

The previous prime is 210220121220997. The next prime is 210220121221069. The reversal of 210220121221020 is 20122121022012.

It is a happy number.

210220121221020 is a `hidden beast` number, since 2 + 1 + 0 + 220 + 1 + 212 + 210 + 20 = 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 = 210220121220984 and 210220121221002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20540937 + ... + 29023616.

It is an arithmetic number, because the mean of its divisors is an integer number (8856871890958).

Almost surely, 2^{210220121221020} is an apocalyptic number.

210220121221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210220121221020 is an abundant number, since it is smaller than the sum of its proper divisors (427474654927956).

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

210220121221020 is a wasteful number, since it uses less digits than its factorization.

210220121221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49588131 (or 49588126 counting only the distinct ones).

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

Adding to 210220121221020 its reverse (20122121022012), we get a palindrome (230342242243032).

The spelling of 210220121221020 in words is "two hundred ten trillion, two hundred twenty billion, one hundred twenty-one million, two hundred twenty-one thousand, twenty".