21024051530 has 8 divisors (see below), whose sum is σ = 37843292772. Its totient is φ = 8409620608.

The previous prime is 21024051523. The next prime is 21024051547. The reversal of 21024051530 is 3515042012.

It can be written as a sum of positive squares in 2 ways, for example, as 17710552561 + 3313498969 = 133081^2 + 57563^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21024051496 and 21024051505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051202567 + ... + 1051202586.

Almost surely, 2^21024051530 is an apocalyptic number.

21024051530 is a deficient number, since it is larger than the sum of its proper divisors (16819241242).

21024051530 is a wasteful number, since it uses less digits than its factorization.

21024051530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102405160.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 21024051530 its reverse (3515042012), we get a palindrome (24539093542).

The spelling of 21024051530 in words is "twenty-one billion, twenty-four million, fifty-one thousand, five hundred thirty".