1209921116 has 12 divisors (see below), whose sum is σ = 2122951320. Its totient is φ = 603363600.

The previous prime is 1209921101. The next prime is 1209921131. The reversal of 1209921116 is 6111299021.

It is an interprime number because it is at equal distance from previous prime (1209921101) and next prime (1209921131).

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, 397535 + ... + 400566.

It is an arithmetic number, because the mean of its divisors is an integer number (176912610).

Almost surely, 2^1209921116 is an apocalyptic number.

It is an amenable number.

1209921116 is a deficient number, since it is larger than the sum of its proper divisors (913030204).

1209921116 is a wasteful number, since it uses less digits than its factorization.

1209921116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798484 (or 798482 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 1209921116 is about 34783.9203655942. The cubic root of 1209921116 is about 1065.5790795232.

The spelling of 1209921116 in words is "one billion, two hundred nine million, nine hundred twenty-one thousand, one hundred sixteen".