121221022001004 has 36 divisors (see below), whose sum is σ = 306468684762240. Its totient is φ = 40400561731680.

The previous prime is 121221022000951. The next prime is 121221022001021. The reversal of 121221022001004 is 400100220122121.

121221022001004 is a `hidden beast` number, since 121 + 221 + 0 + 220 + 0 + 100 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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 11 ways as a sum of consecutive naturals, for example, 268337932 + ... + 268789299.

Almost surely, 2^{121221022001004} is an apocalyptic number.

It is an amenable number.

121221022001004 is an abundant number, since it is smaller than the sum of its proper divisors (185247662761236).

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

121221022001004 is a wasteful number, since it uses less digits than its factorization.

121221022001004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537133510 (or 537133505 counting only the distinct ones).

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

Adding to 121221022001004 its reverse (400100220122121), we get a palindrome (521321242123125).

The spelling of 121221022001004 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-two million, one thousand, four".