1131252021 has 16 divisors (see below), whose sum is σ = 1677614400. Its totient is φ = 753409584.

The previous prime is 1131251999. The next prime is 1131252037. The reversal of 1131252021 is 1202521311.

1131252021 is a `hidden beast` number, since 113 + 12 + 520 + 21 = 666.

It is not a de Polignac number, because 1131252021 - 2¹³ = 1131243829 is a prime.

It is a super-2 number, since 2×1131252021² = 2559462270033168882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1131251985 and 1131252003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131252821) 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, 6955 + ... + 48071.

It is an arithmetic number, because the mean of its divisors is an integer number (104850900).

Almost surely, 2^1131252021 is an apocalyptic number.

It is an amenable number.

1131252021 is a deficient number, since it is larger than the sum of its proper divisors (546362379).

1131252021 is a wasteful number, since it uses less digits than its factorization.

1131252021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42145 (or 42139 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1131252021 is about 33634.0901616202. The cubic root of 1131252021 is about 1041.9649798564.

Adding to 1131252021 its reverse (1202521311), we get a palindrome (2333773332).

The spelling of 1131252021 in words is "one billion, one hundred thirty-one million, two hundred fifty-two thousand, twenty-one".