121221021002000 has 80 divisors (see below), whose sum is σ = 305856447541632. Its totient is φ = 46380216713600.

The previous prime is 121221021001987. The next prime is 121221021002009. The reversal of 121221021002000 is 200120122121.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (121221021002009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1317573794 + ... + 1317665793.

Almost surely, 2^{121221021002000} is an apocalyptic number.

121221021002000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221021002000 is an abundant number, since it is smaller than the sum of its proper divisors (184635426539632).

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

121221021002000 is a wasteful number, since it uses less digits than its factorization.

121221021002000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2635239633 (or 2635239617 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121221021002000 its reverse (200120122121), we get a palindrome (121421141124121).

The spelling of 121221021002000 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, two thousand".