1111212021989 has 16 divisors (see below), whose sum is σ = 1141375561920. Its totient is φ = 1081545828480.

The previous prime is 1111212021971. The next prime is 1111212022027. The reversal of 1111212021989 is 9891202121111.

It is a cyclic number.

It is not a de Polignac number, because 1111212021989 - 2¹⁶ = 1111211956453 is a prime.

It is a super-2 number, since 2×1111212021989² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111212021949) 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, 1387199 + ... + 2036355.

It is an arithmetic number, because the mean of its divisors is an integer number (71335972620).

Almost surely, 2^{1111212021989} is an apocalyptic number.

It is an amenable number.

1111212021989 is a deficient number, since it is larger than the sum of its proper divisors (30163539931).

1111212021989 is a wasteful number, since it uses less digits than its factorization.

1111212021989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649540.

The product of its (nonzero) digits is 5184, while the sum is 38.

The spelling of 1111212021989 in words is "one trillion, one hundred eleven billion, two hundred twelve million, twenty-one thousand, nine hundred eighty-nine".