121221444004 has 6 divisors (see below), whose sum is σ = 212137527014. Its totient is φ = 60610722000.

The previous prime is 121221443999. The next prime is 121221444011. The reversal of 121221444004 is 400444122121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 108900000000 + 12321444004 = 330000^2 + 111002^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121221444004.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15152680497 + ... + 15152680504.

Almost surely, 2^121221444004 is an apocalyptic number.

It is an amenable number.

121221444004 is a deficient number, since it is larger than the sum of its proper divisors (90916083010).

121221444004 is a wasteful number, since it uses less digits than its factorization.

121221444004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30305361005 (or 30305361003 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 121221444004 its reverse (400444122121), we get a palindrome (521665566125).

The spelling of 121221444004 in words is "one hundred twenty-one billion, two hundred twenty-one million, four hundred forty-four thousand, four".