121221021221000 has 64 divisors (see below), whose sum is σ = 283676664360960. Its totient is φ = 48485079480000.

The previous prime is 121221021220979. The next prime is 121221021221093. The reversal of 121221021221000 is 122120122121.

It is a self number, because there is not a number n which added to its sum of digits gives 121221021221000.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10437035 + ... + 18744965.

It is an arithmetic number, because the mean of its divisors is an integer number (4432447880640).

Almost surely, 2^{121221021221000} is an apocalyptic number.

121221021221000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221021221000 is an abundant number, since it is smaller than the sum of its proper divisors (162455643139960).

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

121221021221000 is a wasteful number, since it uses less digits than its factorization.

121221021221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8322543 (or 8322529 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121221021221000 its reverse (122120122121), we get a palindrome (121343141343121).

The spelling of 121221021221000 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, two hundred twenty-one thousand".