21150432015 has 32 divisors (see below), whose sum is σ = 34492594176. Its totient is φ = 11063095680.

The previous prime is 21150432013. The next prime is 21150432029. The reversal of 21150432015 is 51023405112.

It is a happy number.

It is not a de Polignac number, because 21150432015 - 2¹ = 21150432013 is a prime.

It is a super-2 number, since 2×21150432015² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150432011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3837892 + ... + 3843398.

It is an arithmetic number, because the mean of its divisors is an integer number (1077893568).

Almost surely, 2^21150432015 is an apocalyptic number.

21150432015 is a deficient number, since it is larger than the sum of its proper divisors (13342162161).

21150432015 is a wasteful number, since it uses less digits than its factorization.

21150432015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10399.

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 21150432015 its reverse (51023405112), we get a palindrome (72173837127).

The spelling of 21150432015 in words is "twenty-one billion, one hundred fifty million, four hundred thirty-two thousand, fifteen".