21004151530 has 8 divisors (see below), whose sum is σ = 37807472772. Its totient is φ = 8401660608.

The previous prime is 21004151507. The next prime is 21004151537. The reversal of 21004151530 is 3515140012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17472345489 + 3531806041 = 132183^2 + 59429^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21004151537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050207567 + ... + 1050207586.

Almost surely, 2^21004151530 is an apocalyptic number.

21004151530 is a deficient number, since it is larger than the sum of its proper divisors (16803321242).

21004151530 is a wasteful number, since it uses less digits than its factorization.

21004151530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100415160.

The product of its (nonzero) digits is 600, while the sum is 22.

Adding to 21004151530 its reverse (3515140012), we get a palindrome (24519291542).

The spelling of 21004151530 in words is "twenty-one billion, four million, one hundred fifty-one thousand, five hundred thirty".