121221000001010 has 64 divisors (see below), whose sum is σ = 268557034636800. Its totient is φ = 38363606042112.

The previous prime is 121221000000979. The next prime is 121221000001019. The reversal of 121221000001010 is 10100000122121.

It is a junction number, because it is equal to n+sod(n) for n = 121221000000982 and 121221000001000.

It is not an unprimeable number, because it can be changed into a prime (121221000001019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40674686 + ... + 43553094.

It is an arithmetic number, because the mean of its divisors is an integer number (4196203666200).

Almost surely, 2^{121221000001010} is an apocalyptic number.

121221000001010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221000001010 is an abundant number, since it is smaller than the sum of its proper divisors (147336034635790).

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

121221000001010 is a wasteful number, since it uses less digits than its factorization.

121221000001010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2924715.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 121221000001010 its reverse (10100000122121), we get a palindrome (131321000123131).

The spelling of 121221000001010 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one thousand, ten".