21055124530 has 64 divisors (see below), whose sum is σ = 42215427072. Its totient is φ = 7496533440.

The previous prime is 21055124527. The next prime is 21055124539. The reversal of 21055124530 is 3542155012.

It is not an unprimeable number, because it can be changed into a prime (21055124539) 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, 1222237 + ... + 1239343.

It is an arithmetic number, because the mean of its divisors is an integer number (659616048).

Almost surely, 2^21055124530 is an apocalyptic number.

21055124530 is an abundant number, since it is smaller than the sum of its proper divisors (21160302542).

21055124530 is a wasteful number, since it uses less digits than its factorization.

21055124530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17359.

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 21055124530 its reverse (3542155012), we get a palindrome (24597279542).

The spelling of 21055124530 in words is "twenty-one billion, fifty-five million, one hundred twenty-four thousand, five hundred thirty".