1212101989 has 16 divisors (see below), whose sum is σ = 1487414016. Its totient is φ = 964051200.

The previous prime is 1212101963. The next prime is 1212102013. The reversal of 1212101989 is 9891012121.

It is not a de Polignac number, because 1212101989 - 2⁷ = 1212101861 is a prime.

It is a super-2 number, since 2×1212101989² = 2938382463475512242, which 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 (1212101929) 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, 63282 + ... + 80179.

It is an arithmetic number, because the mean of its divisors is an integer number (92963376).

Almost surely, 2^1212101989 is an apocalyptic number.

It is an amenable number.

1212101989 is a deficient number, since it is larger than the sum of its proper divisors (275312027).

1212101989 is a wasteful number, since it uses less digits than its factorization.

1212101989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143556.

The product of its (nonzero) digits is 2592, while the sum is 34.

The square root of 1212101989 is about 34815.2551189848. The cubic root of 1212101989 is about 1066.2189277865.

The spelling of 1212101989 in words is "one billion, two hundred twelve million, one hundred one thousand, nine hundred eighty-nine".