1151430021 has 24 divisors (see below), whose sum is σ = 1907867520.
Its totient is φ = 655504416.
The previous prime is 1151430011. The next prime is 1151430023. The reversal of 1151430021 is 1200341511.
Adding to 1151430021 its reverse (1200341511), we get a palindrome (2351771532).
It is not a de Polignac number, because 1151430021 - 210 = 1151428997 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 1151429976 and 1151430003.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1151430023) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17025 + ... + 50918.
It is an arithmetic number, because the mean of its divisors is an integer number (79494480).
Almost surely, 21151430021 is an apocalyptic number.
It is an amenable number.
1151430021 is a deficient number, since it is larger than the sum of its proper divisors (756437499).
1151430021 is a wasteful number, since it uses less digits than its factorization.
1151430021 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 68225 (or 68222 counting only the distinct ones).
The product of its (nonzero) digits is 120, while the sum is 18.
The square root of 1151430021 is about 33932.7278744283.
The cubic root of 1151430021 is about 1048.1236393982.
The spelling of 1151430021 in words is "one billion, one hundred fifty-one million, four hundred thirty thousand, twenty-one".