1221220120986 has 48 divisors (see below), whose sum is σ = 2652710860800. Its totient is φ = 406037696064.

The previous prime is 1221220120979. The next prime is 1221220120997. The reversal of 1221220120986 is 6890210221221.

1221220120986 is a `hidden beast` number, since 1 + 221 + 220 + 1 + 209 + 8 + 6 = 666.

It is a super-2 number, since 2×1221220120986² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221220120986.

It is an unprimeable number.

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 in 23 ways as a sum of consecutive naturals, for example, 86869270 + ... + 86883326.

It is an arithmetic number, because the mean of its divisors is an integer number (55264809600).

Almost surely, 2^{1221220120986} is an apocalyptic number.

1221220120986 is an abundant number, since it is smaller than the sum of its proper divisors (1431490739814).

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

1221220120986 is a wasteful number, since it uses less digits than its factorization.

1221220120986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26003 (or 26000 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 1221220120986 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, one hundred twenty thousand, nine hundred eighty-six".