121210220020 has 24 divisors (see below), whose sum is σ = 254672145000. Its totient is φ = 48459196032.

The previous prime is 121210219981. The next prime is 121210220081. The reversal of 121210220020 is 20022012121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 61585370896 + 59624849124 = 248164^2 + 244182^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1515795 + ... + 1593754.

It is an arithmetic number, because the mean of its divisors is an integer number (10611339375).

Almost surely, 2^121210220020 is an apocalyptic number.

121210220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121210220020 is an abundant number, since it is smaller than the sum of its proper divisors (133461924980).

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

121210220020 is a wasteful number, since it uses less digits than its factorization.

121210220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3111507 (or 3111505 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 121210220020 its reverse (20022012121), we get a palindrome (141232232141).

The spelling of 121210220020 in words is "one hundred twenty-one billion, two hundred ten million, two hundred twenty thousand, twenty".