121216020028 has 24 divisors (see below), whose sum is σ = 213547944960. Its totient is φ = 60202958400.

The previous prime is 121216020019. The next prime is 121216020049. The reversal of 121216020028 is 820020612121.

It is a super-2 number, since 2×121216020028² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121216019984 and 121216020011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688453 + ... + 846403.

It is an arithmetic number, because the mean of its divisors is an integer number (8897831040).

Almost surely, 2^121216020028 is an apocalyptic number.

It is an amenable number.

121216020028 is a deficient number, since it is larger than the sum of its proper divisors (92331924932).

121216020028 is a wasteful number, since it uses less digits than its factorization.

121216020028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159237 (or 159235 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

Adding to 121216020028 its reverse (820020612121), we get a palindrome (941236632149).

The spelling of 121216020028 in words is "one hundred twenty-one billion, two hundred sixteen million, twenty thousand, twenty-eight".