121221222001972 has 6 divisors (see below), whose sum is σ = 212137138503458. Its totient is φ = 60610611000984.

The previous prime is 121221222001963. The next prime is 121221222001973. The reversal of 121221222001972 is 279100222122121.

It can be written as a sum of positive squares in only one way, i.e., 121067021278116 + 154200723856 = 11003046^2 + 392684^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221222001973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15152652750243 + ... + 15152652750250.

Almost surely, 2^{121221222001972} is an apocalyptic number.

It is an amenable number.

121221222001972 is a deficient number, since it is larger than the sum of its proper divisors (90915916501486).

121221222001972 is a wasteful number, since it uses less digits than its factorization.

121221222001972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30305305500497 (or 30305305500495 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The spelling of 121221222001972 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, one thousand, nine hundred seventy-two".