121221211001010 has 16 divisors (see below), whose sum is σ = 290930906402496. Its totient is φ = 32325656266928.

The previous prime is 121221211000997. The next prime is 121221211001017. The reversal of 121221211001010 is 10100112122121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (121221211001017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2020353516654 + ... + 2020353516713.

It is an arithmetic number, because the mean of its divisors is an integer number (18183181650156).

Almost surely, 2^{121221211001010} is an apocalyptic number.

121221211001010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221211001010 is an abundant number, since it is smaller than the sum of its proper divisors (169709695401486).

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

121221211001010 is a wasteful number, since it uses less digits than its factorization.

121221211001010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4040707033377.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121221211001010 its reverse (10100112122121), we get a palindrome (131321323123131).

The spelling of 121221211001010 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred eleven million, one thousand, ten".