121221121996 has 48 divisors (see below), whose sum is σ = 232160773824. Its totient is φ = 55047960576.

The previous prime is 121221121951. The next prime is 121221121997. The reversal of 121221121996 is 699121122121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (121221121997) 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, 729721 + ... + 880303.

It is an arithmetic number, because the mean of its divisors is an integer number (4836682788).

Almost surely, 2^121221121996 is an apocalyptic number.

It is an amenable number.

121221121996 is a deficient number, since it is larger than the sum of its proper divisors (110939651828).

121221121996 is a wasteful number, since it uses less digits than its factorization.

121221121996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150850 (or 150848 counting only the distinct ones).

The product of its digits is 7776, while the sum is 37.

The spelling of 121221121996 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, nine hundred ninety-six".