1361221272 has 24 divisors (see below), whose sum is σ = 3686641140. Its totient is φ = 453740400.

The previous prime is 1361221249. The next prime is 1361221319. The reversal of 1361221272 is 2721221631.

1361221272 is a `hidden beast` number, since 1 + 3 + 612 + 21 + 27 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9452854 + ... + 9452997.

Almost surely, 2^1361221272 is an apocalyptic number.

1361221272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1361221272 is an abundant number, since it is smaller than the sum of its proper divisors (2325419868).

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

1361221272 is a wasteful number, since it uses less digits than its factorization.

1361221272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18905863 (or 18905856 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 1361221272 is about 36894.7323069297. The cubic root of 1361221272 is about 1108.2631908324.

The spelling of 1361221272 in words is "one billion, three hundred sixty-one million, two hundred twenty-one thousand, two hundred seventy-two".