121221222002010 has 144 divisors (see below), whose sum is σ = 343889593283808. Its totient is φ = 29611290384000.

The previous prime is 121221222002009. The next prime is 121221222002051. The reversal of 121221222002010 is 10200222122121.

It is a happy number.

121221222002010 is a `hidden beast` number, since 1 + 21 + 221 + 2 + 220 + 0 + 201 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 28426716 + ... + 32411735.

It is an arithmetic number, because the mean of its divisors is an integer number (2388122175582).

Almost surely, 2^{121221222002010} is an apocalyptic number.

121221222002010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221222002010 is an abundant number, since it is smaller than the sum of its proper divisors (222668371281798).

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

121221222002010 is a wasteful number, since it uses less digits than its factorization.

121221222002010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60838621 (or 60838605 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121221222002010 its reverse (10200222122121), we get a palindrome (131421444124131).

The spelling of 121221222002010 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, two thousand, ten".