1221111001982 has 8 divisors (see below), whose sum is σ = 1831700417400. Its totient is φ = 610544196184.

The previous prime is 1221111001933. The next prime is 1221111001991. The reversal of 1221111001982 is 2891001111221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1221111001982² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5516732 + ... + 5733807.

It is an arithmetic number, because the mean of its divisors is an integer number (228962552175).

Almost surely, 2^{1221111001982} is an apocalyptic number.

1221111001982 is a deficient number, since it is larger than the sum of its proper divisors (610589415418).

1221111001982 is a wasteful number, since it uses less digits than its factorization.

1221111001982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11304810.

The product of its (nonzero) digits is 576, while the sum is 29.

The spelling of 1221111001982 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, one thousand, nine hundred eighty-two".