1212921288 has 48 divisors (see below), whose sum is σ = 3398276700. Its totient is φ = 390364800.

The previous prime is 1212921263. The next prime is 1212921289. The reversal of 1212921288 is 8821292121.

It can be written as a sum of positive squares in 2 ways, for example, as 1147989924 + 64931364 = 33882^2 + 8058^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1212921289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 288363 + ... + 292538.

Almost surely, 2^1212921288 is an apocalyptic number.

1212921288 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1212921288 is an abundant number, since it is smaller than the sum of its proper divisors (2185355412).

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

1212921288 is a wasteful number, since it uses less digits than its factorization.

1212921288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580942 (or 580935 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 1212921288 is about 34827.0195107190. The cubic root of 1212921288 is about 1066.4591043180.

The spelling of 1212921288 in words is "one billion, two hundred twelve million, nine hundred twenty-one thousand, two hundred eighty-eight".