1211521472 has 84 divisors (see below), whose sum is σ = 2943956520. Its totient is φ = 491871744.

The previous prime is 1211521469. The next prime is 1211521483. The reversal of 1211521472 is 2741251121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49418 + ... + 69750.

Almost surely, 2^1211521472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211521472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1471978260).

1211521472 is an abundant number, since it is smaller than the sum of its proper divisors (1732435048).

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

1211521472 is a wasteful number, since it uses less digits than its factorization.

1211521472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20378 (or 20361 counting only the distinct ones).

The product of its digits is 1120, while the sum is 26.

The square root of 1211521472 is about 34806.9170137201. The cubic root of 1211521472 is about 1066.0486843970.

Adding to 1211521472 its reverse (2741251121), we get a palindrome (3952772593).

The spelling of 1211521472 in words is "one billion, two hundred eleven million, five hundred twenty-one thousand, four hundred seventy-two".